Posts Tagged ‘sweet corn’

Sweet Corn IPM Newsletter No. 11 – September 6, 2013

Friday, September 6th, 2013

Sweet Corn

Sweet Corn IPM Newsletter No. 11 – September 6, 2013

For full page print version, please see link at the bottom. Click on photos to enlarge.

Last Regular Issue for 2013

LATE SILKING CORN STILL NEEDS PROTECTION

Higher Earworm Counts in Southern and Coastal Locations

This will be the final issue of the Sweet Corn IPM Newsletter for the 2013 season. I would like to thank all of the growers who participated in the program this year, and our team of IPM scouts including Kara Rowley, Hayden Koller, Tammy Cushman, Griffin Dill and Sean McAuley, with help from John Hutton. Thanks to Pam St. Peter for getting us to print and keeping up the web page.  Input from our readers is welcome. Please call or e-mail us with your questions, comments and suggestions.

SITUATION
The storm last week appears to have brought some corn earworm moths into the state, as well as several inches of rain. Post Labor Day corn has matured quickly, but the market seems to be holding well, even with a plentiful supply. Insect pressure is relatively low for this late in the summer, especially in more northern and inland sites; although any weather coming up from the tropics over the next few weeks could change that status very quickly.

European corn borer:  Moth catches were fairly low and sporadic this week. A weak second generation appears to be showing up in a few locations, but most sites are well under threshold. Fields in Dayton, North Berwick, Wayne and Wells exceeded the threshold of 5 moths per week in silking corn, but only the Wayne field is not presently under a spray interval for corn earworm.

Corn earworm:  Moth counts were higher in some southern and coastal locations this week, suggesting that the recent storm may have brought in some moths. A 4-day spray interval for fresh silking corn was recommended at one site in Cape Elizabeth. A 5-day spray interval was recommended in Monmouth and the other Cape Elizabeth site. A 6-day spray interval was recommended for silking fields in Biddeford, a Dayton site, New Gloucester, North Berwick, Poland Spring, Sabattus, Warren and one Wells site. Remember that any storm fronts moving up from the south can bring lots of corn earworm with them and change the situation rapidly for any silking corn remaining.

Corn Earworm Larvae

Corn Earworm Larvae, photo by David Handley

Fall Armyworm Injury on Corn Leaves

Fall Armyworm Injury on Corn Leaves, photo by David Handley

Fall armyworm:  Moth counts were higher in some sites this week, but most remain under threshold for silking corn. Fall armyworm exceeded the threshold of three moths for silking corn in Cape Elizabeth, Dayton, Monmouth, New Gloucester, Nobleboro, Oxford, Warren and Wells.

Remember to plow down your corn stalks.
Plowing down corn stalks destroys overwintering sites for European corn borer. Winter rye can be planted after plow down to prevent soil erosion and conserve nutrients.

Male and Female Spotted Wing Drosophila Flies

Male (left) and Female (right) Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

Spotted Wing Drosophila Alert:  Fruit fly counts are increasing significantly this week and we’re getting more reports of larvae in ripening fruit, including fall raspberries, blueberries, blackberries and grapes. All ripening fruit should be protected with regular and repeated treatments of an approved insecticide. In most fields a 4 to 5 day spray interval is needed to prevent infestation.  Visit our website for details:  http://umaine.edu/highmoor/spotted-wing-drosophila/.

The New England Vegetable & Fruit Conference will be held in Manchester, New Hampshire on December 17, 18, and 19, 2013. Program and registration information will be coming soon.  Visit the website: http://www.newenglandvfc.org/.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259        Orono, ME  04473
207.933.2100                          1.800.287.0279

Sweet Corn IPM Weekly Scouting Summary

Location CEW
Moths
ECB
Moths
FAW
Moths
Recommendations / Comments
Auburn 0 0 0 No spray recommended
Biddeford 3 2 1 6-day spray interval recommended on all silking corn
Cape Elizabeth I 4 3 0 5-day spray interval recommended on all silking corn
Cape Elizabeth II 12 0 5 4-day spray interval recommended on all silking corn
Dayton I 1 3 3 One spray recommended for FAW on all silking corn
Dayton II 3 11 1 6-day spray interval recommended on all silking corn
Farmington 0 1 1 No spray recommended
Lewiston 0 3 0 No spray recommended
Monmouth 4 3 3 5-day spray interval recommended on all silking corn
New Gloucester 2 0 3 6-day spray interval recommended on all silking corn
Nobleboro 0 0 6 One spray recommended for FAW on all silking corn
No. Berwick 3 8 0 6-day spray interval recommended on all silking corn
Oxford 0 0 3 One spray recommended for FAW on all silking corn
Poland Spring 2 0 0 6-day spray interval recommended on all silking corn
Sabattus 2 1 1 6-day spray interval recommended on all silking corn
Wales 0 0 2 No spray recommended
Warren 3 2 9 6-day spray interval recommended on all silking corn
Wayne 0 6 0 One spray recommended for ECB on all silking corn
Wells I 0 0 0 No spray recommended
Wells II 2 5 5 6-day spray interval recommended on all silking corn

 

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage:  30% or more of plants scouted show injury.
Pre-tassel-silk:  15% or more of plants scouted show injury.
Silk:  5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

Sweet Corn IPM Newsletter No. 10 – August 30, 2013

Tuesday, September 3rd, 2013

Sweet CornSweet Corn IPM Newsletter No. 10 – August 30, 2013

For full page print version, please see link at the bottom. Click on photos to enlarge.

LOW CORN PEST PRESSURE FOR LATE SEASON CORN

Higher Fall Armyworm Moth Counts in some Southern and Coastal Locations

SITUATION
Late corn has been maturing quickly in much of the state, under good weather conditions. It looks as though there will be a good supply of high quality corn for the holiday weekend. Insect pests remain fairly quiet this week.  Vertebrate pest problems have been increasing. Many fields have been visited by hungry birds, skunks, raccoons and deer recently. Next week will be the last regular issue of the Sweet Corn IPM Newsletter for the 2013 season.

Corn Harvester

Corn Harvester, photo by David Handley

European Corn Borer Moth

European Corn Borer Moth, photo by David Handley

European corn borer:  Moth catches were up in some locations this week suggesting that a weak second generation of European corn borer may be getting started in southern Maine. These moths could threaten silking corn in fields that are not under a regular spray schedule for corn earworm. Fields in New Gloucester, Nobleboro, North Berwick and Sabattus exceeded the threshold of 5 moths per week in silking corn; but the North Berwick field is under a spray interval for corn earworm, so no additional sprays should be required. Nearly all fields are in silk, so we did not scout for feeding damage this week, but based our recommendations on pheromone trap catches.

Corn earworm:  Moth counts were lower in most locations this week. Most traps caught no moths and therefore no spray intervals were recommended this week for silking corn at those sites. A 5-day spray interval was recommended for fields in one of the Dayton sites and Charleston this week. A 6-day spray interval was recommended for silking fields in Auburn, a Dayton site and North Berwick. While the relatively light pressure has meant a relaxed spray schedule for many growers this season, remember that any storm fronts that move up the coast from the south in the coming days and weeks could bring lots of corn earworm with them and change the situation rapidly for any silking corn.

Fall armyworm:  Moth counts were higher in some southern and coastal sites, but most caught few or no moths this week. Fall armyworm exceeded the weekly threshold of three moths for silking corn in Biddeford, Cape Elizabeth, Dayton, Monmouth, Nobleboro, Warren and Wells.

Male Fall Armyworm Moth

Male Fall Armyworm Moth, photo by David Handley

Spotted Wing Drosophila on Raspberry

SWD on Raspberry, photo by David Handley.

Spotted Wing Drosophila Alert:  Fruit fly counts are increasing at many sites this week, and more sites are now catching flies. We have more grower reports of larvae in fruit, indicating that even low trap captures signal a significant threat. We recommend that all ripening fruit be protected with an approved insecticide. Regular and repeated treatments are needed to keep fruit from becoming infested. In some locations a 7-day spray interval has not been adequate to prevent infestation, so we have tightened the spray schedule to 4 to 5 days. Chilling fruit to as close to 32ºF immediately after harvest can significantly reduce the activity and emergence of any larvae. Visit our Spotted Wing Drosophila blog for more details.

Understanding and Managing Soils for Healthy Productive Crops: This series will offer farmers strategies to successfully manage soils for long-term productivity. It will take place on Tuesdays, 6:00 PM to 8:00 PM on October 1, 8, 15, 22 and 29, at the Knox and Lincoln Counties Cooperative Extension Office, 377 Manktown Road, Waldoboro, Maine. Cost is $40 per person for the series, or $10 per session. Contact Mark Hutchinson at 207.832.0343 or mhutch@maine.edu for more information, or visit the UMaine Cooperative Extension Agriculture Programs website.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259        Orono, ME  04473
207.933.2100                          1.800.287.0279

 

Sweet Corn IPM Weekly Scouting Summary

 

Location CEW
Moths
ECB
Moths
FAW
Moths
Recommendations / Comments
Auburn 2 0 0 6-day spray interval recommended on all silking corn
Biddeford 0 0 10 One spray recommended for FAW on all silking corn
Cape Elizabeth I 1 0 10 One spray recommended for FAW on all silking corn
Cape Elizabeth II 1 3 7 One spray recommended for FAW on all silking corn
Charleston 4 1 1 5-day spray interval recommended on all silking corn
Dayton I 2 3 3 6-day spray interval recommended on all silking corn
Dayton II 4 2 0 5-day spray interval recommended on all silking corn
Farmington 0 4 0 No spray recommended
Garland 0 3 1 No spray recommended
Levant 0 2 0 No spray recommended
Lewiston 0 0 No spray recommended
Monmouth 1 1 3 One spray recommended for FAW on all silking corn
New Gloucester 1 7 One spray recommended for ECB on all silking corn
Nobleboro 0 6 4 One spray recommended for FAW+ECB on all silking corn
No. Berwick 3 6 6-day spray interval recommended on all silking corn
Oxford 0 1 0 No spray recommended
Palmyra 0 1 0 No spray recommended
Sabattus 0 6 2 One spray recommended for ECB on all silking corn
Wales 0 1 1 No spray recommended
Warren 0 1 11 One spray recommended for FAW on all silking corn
Wayne 0 2 0 No spray recommended
Wells I 0 0 0 No spray recommended
Wells II 1 3 7 One spray recommended for FAW on all silking corn

 

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage:  30% or more of plants scouted show injury.
Pre-tassel-silk:  15% or more of plants scouted show injury.
Silk:  5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

 

Sweet Corn IPM Newsletter No. 9 – August 23, 2013

Friday, August 23rd, 2013

Sweet Corn Sweet Corn IPM Newsletter No. 9 – August 23, 2013

For full page print version, please see link at the bottom. Click on photos to enlarge.

CORN PEST PRESSURE INCREASING IN SOUTHERN AND COASTAL REGIONS

Higher Moth Counts Require Tighter Spray Schedule for Silking Corn

SITUATION
A stretch of nice weather has been good for corn growth, but also appears to have allowed corn pests to build up in southern and coastal sites. Pest pressure is fairly light for this late in the season, however, as the tropical storm activity that often brings corn pests into the state late in the summer has been very quiet.

European corn borer:  Moth catches were very low again this week, with the exception of a couple of northern sites. Fields in Nobleboro and Levant exceeded the threshold of 5 moths per week in silking corn, but the Nobleboro field is under a spray interval for corn earworm, so no additional sprays should be required. No fields had European corn borer feeding damage over threshold.

Corn earworm:  Moth counts are rising in some southern and coastal locations, although many locations still had no moths in pheromone traps this week and do not require a spray interval for silking corn at this time.  A 4-day spray interval was recommended for silking corn in Biddeford and one Cape Elizabeth site.  A 5-day spray interval was recommended for fields in Auburn, Dayton and Nobleboro, Warren and one Wells site. A 6-day spray interval was recommended for silking fields in Lewiston, Monmouth and New Gloucester.

Corn Earworm Moth

Corn Earworm Moth, photo by David Handley

Adult Fall Armyworm

Adult Fall Armyworm, photo by David Handley

Fall armyworm:  Moth counts have increased in some southern and coastal sites, but many sites caught no moths this week. Fall armyworm moths were caught in Biddeford, Cape Elizabeth, Dayton, Livermore Falls, Monmouth, North Berwick, Oxford, Warren and one Wells site. The Biddeford, Cape Elizabeth, Monmouth, North Berwick, Oxford and Warren sites exceeded the weekly threshold of three moths for silking corn. Fall armyworm feeding damage on younger corn exceeded the spray threshold of 15% only at the Biddeford site.

Spotted Wing Drosophila Larvae in Raspberry

Spotted Wing Drosophila Larvae in Raspberry, photo by David Handley

Spotted Wing Drosophila Alert:  Fruit fly counts remain quite variable around the state. We found high numbers (100+) of flies at two sites, Limington and New Gloucester, and this may be related to lower availability of fruit at these sites, as summer raspberries are now pretty much gone. Most other sites had fewer than 4 flies for the week and many sites had none. At this point however, we recommend that all ripening fruit be protected with a recommended insecticide. Regular and repeated treatments are needed to keep fruit from becoming infested. Visit our Spotted Wing Drosophila blog for more details.

Free Disposal of Banned, Unusable Pesticides:  Farmers are urged to take advantage of a free opportunity to dispose of banned or unusable pesticides that they may have on their properties. This October, the Maine Board of Pesticides Control (BPC) and the Maine Department of Environmental Protection will dispose of banned pesticides or pesticides that have become caked, frozen, or otherwise rendered unusable. This free disposal program is open to homeowners, family-owned farms and greenhouses. All people need to do is register by September 27, 2013. Registration is mandatory; drop-ins are not permitted. To register and get more information on this program and pesticide disposal, go to the BPC website at:  www.thinkfirstspraylast.org, or call 207.287.2731.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259        Orono, ME  04473
207.933.2100                          1.800.287.0279

 

Sweet Corn IPM Weekly Scouting Summary

 

Location CEW
Moths
ECB
Moths
FAW
Moths
%Feeding
Damage
Recommendations / Comments
Auburn 5 0 0 5-day spray interval recommended on all silking corn
Biddeford 8 0 15 15% 4-day spray interval recommended on all silking corn
Cape Elizabeth I 11 0 7 5% 4-day spray interval recommended on all silking corn
Cape Elizabeth II 1 0 16 7% One spray recommended for FAW on all silking corn
Dayton I 6 2 1 3% 5-day spray interval recommended on all silking corn
Farmington 0 2 0 0% No spray recommended
Garland 0 2 0 1% No spray recommended
Levant 0 6 0 4% One spray recommended for ECB on all silking corn
Lewiston 2 2 0 0% 6-day spray interval recommended on all silking corn
Livermore Falls 0 0 1 6% No spray recommended
Monmouth 2 0 8 6-day spray interval recommended on all silking corn
New Gloucester 3 1 0 2% 6-day spray interval recommended on all silking corn
Nobleboro 4 6 0 5-day spray interval recommended on all silking corn
No. Berwick 0 0 13 3% One spray recommended for ECB on all silking corn
Oxford 1 0 3 One spray recommended for FAW on all silking corn
Palmyra 0 4 0 3% No spray recommended
Poland Spring 1 1 0 5% No spray recommended
Sabattus 1 0 0 10% No spray recommended
Warren 7 1 4 5-day spray interval recommended on all silking corn
Wells I 0 0 0 7% No spray recommended
Wells II 6 0 1 0% 5-day spray interval recommended on all silking corn

 

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage:  30% or more of plants scouted show injury.
Pre-tassel-silk:  15% or more of plants scouted show injury.
Silk:  5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

Sweet Corn IPM Newsletter No. 8 – August 16, 2013

Friday, August 16th, 2013

Sweet Corn

Sweet Corn IPM Newsletter No. 8 – August 16, 2013

For full page print version, please see link at the bottom. Click on photos to enlarge.

ANOTHER WEEK OF LOW PEST PRESSURE

Moth Counts and Feeding Injury under Spray Thresholds in Most Corn Fields

SITUATION
Our weather continues to be dominated by fronts coming from the west and northwest, which appears to be keeping corn earworm and fall army worm moths from moving into Maine from the south in high numbers.  Most farms continue to enjoy a light spray schedule for this time of the season.

European corn borer:  Moth catches were very low again this week. In some years we may start to see a second generation of European corn borer moths emerge in the late summer, but there has been no indication of that so far this season. No silking fields exceeded the threshold of 5 moths per week. No fields had European corn borer feeding damage over threshold.

Corn earworm:  Moth counts fell slightly to even lower levels than last week in most locations. Many fields do not require a spray interval for silking corn at this time.  A 5-day spray interval was recommended for fields in Monmouth and Charleston. A 6-day spray interval was recommended for silking fields in Cape Elizabeth, Garland, Levant, North Berwick and Wales.

Fall armyworm:  Moth counts are very low for this late in the season. Fall armyworm moths were caught in Biddeford, Cape Elizabeth, one Dayton site, Levant, Lewiston and Wells this week. Only the Biddeford and Dayton sites exceeded the weekly threshold of three moths for silking corn. Sites in Biddeford and Cape Elizabeth had fall armyworm feeding damage on younger corn exceeding the spray threshold of 15%.

Fall Armyworm on Corn Silk

Fall Armyworm on Corn Silk, photo by David Handley

Aphids on Corn Tassel

Aphids on Corn Tassel, photo by Kaytlin Woodman

Aphids:  Some fields are showing infestations of aphids on corn tassels, silks and husks. While aphid feeding is not usually a significant problem, the sooty mold that develops on the husks as a result of their waste (called honeydew), is often objectionable to customers.  Sprays, other than Bt’s or spinosad products, that are used to control other corn pests also offer control of aphids, including Asana®, Capture®, Warrior® and Lannate®.

Late Blight on Tomato Leaf

Late Blight on Tomato Leaf, photo by James Dill

Late Blight:  Grower and Farm Stand Alert
Late blight has been found on tomato plants in coastal Maine (Warren) this week. This follows reports of late blight in tomato and potato plantings in Vermont and New York. Growers should be alert to catch early symptoms and be ready to apply appropriate control measures.  Symptoms include water-soaked lesions on the leaves with fine, white cottony mycelium on the undersides. Infections on the stems appear as dark, almost black lesions. Please report any suspicious symptoms to the Pest Management Office at 581-3883, or email PMO@umext.maine.edu.

Spotted Wing Drosophila Alert
Fruit fly counts are still variable around the state, but we are catching flies at most locations now, including Limington, Springvale, Wells, Cape Elizabeth, New Gloucester, Gray, Monmouth, Wales, Livermore Falls, Bowdoinham, Dresden and Warren.  Most traps had fewer than ten flies. The exception was, again, our Bowdoinham site, which had over 100 flies. Once spotted wing drosophila is found in your area, fruit should be protected with a recommended insecticide.  Regular and repeated treatments are needed to keep fruit from becoming infested. Visit our Spotted Wing Drosophila blog for more details.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259        Orono, ME  04473
207.933.2100                           1.800.287.0279

 

Sweet Corn IPM Weekly Scouting Summary

 

Location CEW
Moths
ECB
Moths
FAW
Moths
%Feeding
Damage
Recommendations / Comments
Auburn 0 1 0 2% No spray recommended
Biddeford 0 1 6 16% One spray recommended for FAW
Cape Elizabeth 2 2 2 26% 6-day spray interval recommended on all silking corn
Charleston 6 0 0 2% 5-day spray interval recommended on all silking corn
Dayton I 0 0 6 3% One spray recommended for FAW
Dayton II 0 0 0 1% No spray recommended
Farmington 0 0 0 0% No spray recommended
Garland 3 1 0 3% 6-day spray interval recommended on all silking corn
Levant 3 1 1 3% 6-day spray interval recommended on all silking corn
Lewiston 0 0 1 1% No spray recommended
Monmouth 5 0 2 1% 5-day spray interval recommended on all silking corn
New Gloucester 1 2 0 1% No spray recommended
Nobleboro 1 1 0 12% No spray recommended
No. Berwick 2 1 0 3% 6-day spray interval recommended on all silking corn
Palmyra 0 1 0 4% No spray recommended
Sabattus 0 0 0 0% No spray recommended
Wales 2 0 0 6-day spray interval recommended on all silking corn
Warren 1 0 0 5% No spray recommended
Wells 0 0 1 8% No spray recommended

 

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage: 30% or more of plants scouted show injury.
Pre-tassel-silk: 15% or more of plants scouted show injury.
Silk: 5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

Sweet Corn IPM Newsletter No. 7 – August 9, 2013

Friday, August 9th, 2013

Sweet CornSweet Corn IPM Newsletter No. 7 – August 9, 2013

For full page print version, please see link at the bottom. Click on photos to enlarge.

CORN PEST PRESSURE REMAINS LIGHT IN MOST FIELDS

Corn Earworm, Fall Armyworm & European Corn Borer Damage Low

SITUATION
Another week of fairly light insect pressure in most locations this week, thanks to a relatively stable weather pattern. Storm fronts coming across from the Midwest or the South could quickly bring higher moth counts to the state, but for now most farms are enjoying a light spray schedule for this time of the season.

European corn borer: Moth catches were very low across the state this week. No silking fields exceeded the threshold of 5 moths per week. European corn borer feeding damage was over threshold in a pre-tassel field in Oxford this week. When European corn borer and fall armyworm damage are found in the same field, the damage is combined and the spray threshold is lowered to 12% injury. This week a field in Sabattus exceeded the combined injury level.

Corn earworm: Moth counts continued to be low in all locations this week and many fields required no additional protection. A 5-day spray interval was recommended for one site in Cape Elizabeth, Charleston, one site in Dayton, and New Gloucester. A 6-day spray interval was recommended for silking fields in Biddeford, Garland, and Nobleboro.

European Corn Borer Entry Hole

European Corn Borer Entry Hole, photo by David Handley

Fall Armyworm Eggs on Corn

Fall Armyworm Eggs on Corn, photo by David Handley

Fall armyworm: Most sites have still not seen significant fall armyworm damage this season. Fall armyworm moths were caught only in Biddeford, one Dayton site and in Nobleboro this week. Biddeford and Dayton exceeded the weekly threshold of three moths for silking corn. A single moth was caught in Nobleboro. Our site in Biddeford was the only location where fall armyworm feeding damage on younger corn exceeded the spray threshold.

Squash vine borer: Moth counts continued to drop this week. Squash vine borers were caught in Cape Elizabeth and Dayton, but the threshold of five moths per week was not exceeded at either of these locations.

Plectosporium blight: Symptoms of Plectosporium have also been found in pumpkin fields over the past two weeks. This fungus disease causes white flecking in the surface of the fruit and leaves, leading to collapse of the plants and fruit rot. See the New England Vegetable Management Guide for details. The fungicides Quadris®, Maneb®, Bravo®, Cabrio® and Flint® are labeled for use on pumpkins to control Plectosporium.

Plectosporium blight on pumpkin

Plectosporium blight on pumpkin, photo by Mark Hutton

Male Spotted Wing Drosophila

Male Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

Spotted Wing Drosophila Alert: Fruit fly counts were quite variable this week, with some sights catching few or no flies while one had the highest count of the season. Flies were caught in Wells, Cape Elizabeth, Limington, New Gloucester, Gray, Monmouth, Bowdoinham and Corinna. Most traps had one to three flies in them. The exception was the Bowdoinham site, which had over 200 flies for the week. The tiny larvae of these flies can quickly destroy ripening soft fruit such as raspberries and blueberries. Once spotted wing drosophila is found in your area, fruit should be protected with a recommended insecticide. Regular and repeated treatments are usually needed to keep fruit from becoming infested. Visit our Spotted Wing Drosophila blog for more details.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                    Pest Management Office
P.O. Box 179                          491 College Avenue
Monmouth, ME 04259      Orono, ME 04473
207.933.2100                       1.800.287.0279

Sweet Corn IPM Weekly Scouting Summary

Location CEW
Moths
ECB
Moths
FAW
Moths
%Feeding
Damage
Recommendations / Comments
Auburn 0 0 0 6% No spray recommended
Biddeford 3 0 5 19% 6-day spray interval recommended on all silking corn
Cape Elizabeth I 0 0 0 3% No spray recommended
Cape Elizabeth II 5 0 0 5-day spray interval recommended on all silking corn
Charleston 4 3 0 0% 5-day spray interval recommended on all silking corn
Dayton I 6 1 6 7% 5-day spray interval recommended on all silking corn
Dayton II 0 1 0 8% No spray recommended
Farmington 0 0 0 0% No spray recommended
Garland 3 0 0 0% 6-day spray interval recommended on all silking corn
Levant 0 1 0 3% No spray recommended
Lewiston 0 0 0 0% No spray recommended
Livermore Falls 0 0 0 3% No spray recommended
Monmouth 0 0 No spray recommended
New Gloucester 7 3 0 5-day spray interval recommended on all silking corn
Nobleboro 2 0 1 5% 6-day spray interval recommended on all silking corn
No. Berwick 1 0 0 2% No spray recommended
Oxford 0 1 0 24% One spray recommended for ECB feeding
Palmyra 0 0 0 2% No spray recommended
Poland Spring 0 0 0 7% No spray recommended
Sabattus 0 0 0 18% One spray recommended for ECB+FAW feeding
Wales 0 0 0 5% No spray recommended
Warren 0 0 0 2% No spray recommended
Wells I 1 0 0 2% No spray recommended
Wells II 0 0 0 1% No spray recommended

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage: 30% or more of plants scouted show injury.
Pre-tassel-silk: 15% or more of plants scouted show injury.
Silk: 5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating. Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

Sweet Corn IPM Newsletter No. 6 – August 2, 2013

Friday, August 2nd, 2013

Sweet CornSweet Corn IPM Newsletter No. 6 – August 2, 2013

For full page print version, please see link at the bottom. Click on photos to enlarge.

A FAIRLY QUIET WEEK FOR CORN PESTS

Corn Earworm, Fall Armyworm & European Corn Borer Pressure Remains Light

SITUATION
Weather patterns continue to keep insect pressure fairly light in most locations. Harvest continues to look good, although maturity and supply has been spotty. Keep an eye out for late season diseases, especially corn rust, in younger fields.

European corn borer:  Moth catches in southern Maine were low again this week. Only silking fields in New Gloucester, Charleston and Palmyra were over the threshold of 5 moths per week, but the Charleston site is on a spray schedule for corn earworm, so no additional sprays were required. European corn borer feeding damage was over threshold in a pre-tassel field in Oxford this week. When European corn borer and fall armyworm damage are found in the same field, the damage is combined and the spray threshold is lowered to 12% injury. This week a field in Biddeford exceeded the combined injury level.

European Corn Borer Larva on Ear

European Corn Borer Larva on Ear, photo by David Handley

Corn Earworm Feeding on Corn

Corn Earworm Feeding on Corn, photo by David Handley

Corn earworm:  Moth counts are low in all locations this week and most locations did not require protection. A 5-day spray interval was recommended for Charleston and one site in Dayton. A 6-day spray interval was recommended for silking fields in the other Dayton site, as well as Garland, Sabattus and Warren.

Fall armyworm:  Most sites had few or no fall armyworm moths in pheromone traps this week. The exception was Monmouth, where 5 moths were caught; exceeding the weekly threshold of three for silking corn. This is a late field with no silk yet. Single moths were caught in Biddeford, Dayton and Levant.  Very little fall armyworm feeding damage was found in younger corn fields.

Squash vine borer:  Moth counts were down significantly this week. Squash vine borers were caught in North Berwick, Wells, Dayton, Biddeford and Gray, but the threshold of five moths per week was not exceeded at any of these locations. This pest will likely only have one generation per year in Maine, although a late, partial second generation is possible.

Potato Leafhopper Alert:  Potato leafhopper feeding is showing up in vegetable and berry fields this week. Leafhoppers are small, bullet-shaped insects that feed on plant sap, causing the leaves to become curled, stunted and yellow-streaked. Beans are quite susceptible to the injury, in addition to potatoes and strawberries. The small, whitish leafhoppers adults can be seen flying off the plants when disturbed. The small, (1/16 inch) light green leafhopper nymphs are found on the underside of injured leaves.  Control options are listed in the New England Vegetable Management Guide.

Potato Leafhopper

Potato Leafhopper, photo by James Dill

Male and Female Spotted Wing Drosophila Flies

Male (left) and Female (right) Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

Spotted Wing Drosophila Alert:  Captures of the fruit fly were fairly low this week, indicating that the population has not started its exponential growth yet. Flies were caught in Wells, New Gloucester, Dresden and Bowdoinham. The larvae of these flies can quickly destroy any soft fruit such as raspberries and blueberries. When spotted wing drosophila is found in your area, ripening fruit should be protected with a recommended insecticide. Regular and repeated treatments are usually needed to keep fruit from becoming infested. Visit our Spotted Wing Drosophila blog for more details.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259        Orono, ME  04473
207.933.2100                          1.800.287.0279

Sweet Corn IPM Weekly Scouting Summary

Location CEW
Moths
ECB
Moths
FAW
Moths
%Feeding
Damage
Recommendations / Comments
Auburn 0 0 0 0% No spray recommended
Biddeford 1 1 1 14% One spray recommended for ECB + FAW feeding
Cape Elizabeth I 0 0 0 5% No spray recommended
Cape Elizabeth II 0 6 0 One spray recommended on silking corn for ECB
Charleston 7 17 0 3% 5-day spray interval recommended on all silking corn
Dayton I 3 3 0 0% 6-day spray interval recommended on all silking corn
Dayton II 4 1 1 2% 5-day spray interval recommended on all silking corn
Farmington 0 0 0 0% No spray recommended
Garland 3 3 0 1% 6-day spray interval recommended on all silking corn
Gray 0 4 0 0% No spray recommended
Levant 0 5 1 2% One spray recommended on silking corn for ECB
Lewiston 0 1 0 7% No spray recommended
Livermore Falls 0 0 0 No spray recommended
Monmouth 0 3 5 5% No spray recommended (no silking corn)
New Gloucester 1 12 0 0% One spray recommended on silking corn for ECB
No. Berwick 0 0 0 0% No spray recommended
Oxford 0 0 0 19% One spray recommended for ECB feeding
Palmyra 0 18 0 6% One spray recommended on silking corn for ECB
Sabattus 2 5 0 3% 6-day spray interval recommended on all silking corn
Wales 0 1 0 0% No spray recommended
Warren 2 1 0 7% 6-day spray interval recommended on all silking corn
Wells I 0 0 0 4% No spray recommended

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB:  European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage: 30% or more of plants scouted show injury.
Pre-tassel-silk: 15% or more of plants scouted show injury.
Silk: 5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/

http://www.pestwatch.psu.edu/sweet_corn.htm

http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

Sweet Corn IPM Newsletter No. 5 – July 26, 2013

Friday, July 26th, 2013
Sweet Corn
Sweet Corn IPM Newsletter No. 5 – July 26, 2013
For full page print version, please see link at the bottom. Click on photos to enlarge.

CORN INSECT ACTIVITY REMAINS MODERATE

Squash Vine Borer and Spotted Wing Drosophila Pressure Increasing

SITUATION
Early corn harvest is coming into full swing in southern Maine. Maturity is variable, but overall quality looks good. The weather pattern has been limiting movement of moths into the region, so we have seen very little change in the populations of corn earworm and fall armyworm this week. A front moving in from the south this weekend may change the situation, but for now pest pressure remains moderate.

European Corn Borer on Ear of Corn

European Corn Borer on Ear, photo by David Handley

European corn borer: Moth catches in the southern parts of the state remain quite low this week. Two of the more northern sites had relatively high counts, however. Silking fields in Charleston and Palmyra were well over the threshold of 5 moths per week but the Charleston site is also on a spray schedule for corn earworm, so no additional sprays should be required. European corn borer feeding damage was over threshold in pre-tassel fields in Biddeford, Nobleboro and Warren this week.

Corn earworm:  Moths counts remain quite low in all locations this week and most locations did not require protection. A 4-day spray interval was recommended for Charleston and Garland. A 5-day spray interval was recommended for Levant. A 6-day spray interval was recommended for silking fields in Cape Elizabeth, Hollis and Farmington.

Fall armyworm:  Most sites had few or no fall armyworm moths in pheromone traps this week. The exceptions were Biddeford and New Gloucester, which both had 5 moths, exceeding the weekly threshold of three for silking corn. Neither site was under a spray interval for corn earworm so a spray was recommended for all silking corn. Single moths were caught in just three locations this week including Cape Elizabeth, Charleston and Oxford. Two moths were caught in Nobleboro. There is still relatively little fall armyworm feeding damage in younger corn fields.

Two Squash Vine Borer Moths

Two Squash Vine Borer Moths, photo by Jeffrey Hahn, Univ. of Minnesota

Squash vine borer moths were caught in pheromone traps in Wells, Hollis, Biddeford, Gray, New Gloucester, Nobleboro and Oxford this week. The threshold of five moths per week was exceeded in Biddeford, Hollis, Gray and New Gloucester. Be aware that this pest is very active and continues to threaten summer squash, winter squash and pumpkins. See the New England Vegetable Management Guide for control options.

Spotted Wing Drosophila Alert
Captures of spotted wing drosophila are rising this week. Flies were caught in Wells, New Gloucester, Monmouth, Dresden and Warren.  Numbers at the Warren site have increased significantly, with 84 flies caught this week. The larvae of these flies can quickly destroy any soft fruit such as raspberries and blueberries. If spotted wing drosophila has been captured in your area and you have ripening berries, the crop should be protected at this time with a recommended insecticide. Regular and repeated treatments are usually needed to keep fruit from becoming infested. Visit our Spotted Wing Drosophila blog for more details.

Highmoor Farm

FINAL REMINDER: Highmoor Farm Fruit and Vegetable Growers Field Day July 31, 2013
Join us for the Highmoor Farm Field Day and Summer Tour to be held on Wednesday, July 31, starting at 9:00 a.m. Please join us for the program, farm tours and lunch. Registration fee is $20 per person, including lunch, and preregistration is strongly encouraged. For more information, visit the Highmoor Farm website or call 207.933.2100. If you are a person with a disability and will need any accommodations to participate in this program, please call Pam St. Peter at Highmoor Farm, 207.933.2100 or TDD 1.800.287.8957 to discuss your needs at least 7 days prior to this event.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259        Orono, ME  04473
207.933.2100                          1.800.287.0279

Sweet Corn IPM Weekly Scouting Summary

Location CEW
Moths
ECB
Moths
FAW
Moths
%Feeding
Damage
Recommendations / Comments
Auburn 2 7 0 0% 6-day spray interval recommended on all silking corn
Biddeford 1 0 5 35% One spray recommended on silking corn for FAW
Cape Elizabeth I 0 0 1 5% No spray recommended
Cape Elizabeth II 0 0 0 No spray recommended
Charleston 3 29 1 6% 6-day spray interval recommended on all silking corn
Dayton 0 0 0 7% No spray recommended
Farmington 2 0 0 4% 6-day spray interval recommended on all silking corn
Garland 0 5 0 1% One spray recommended on silking corn for ECB
Gray 0 5 0 7% One spray recommended on silking corn for ECB
Hollis 0 0 0 7% No spray recommended
Levant 0 5 0 3% One spray recommended on silking corn for ECB
Lewiston 2 0 0 5% 6-day spray interval recommended on all silking corn
Livermore Falls 0 0 0 13% No spray recommended
New Gloucester 0 0 5  7% One spray recommended on silking corn for FAW
Nobleboro 0 1 2 23% One spray recommended ECB feeding
No. Berwick 0 0 0 3% No spray recommended
Oxford 1 2 1 6% No spray recommended
Palmyra 0 15 0 1% One spray recommended on silking corn for ECB
Sabattus 3 2 0 5% 6-day spray interval recommended on all silking corn
Wales 3 1 0 6-day spray interval recommended on all silking corn
Warren 1 1 0 15% One spray recommended for ECB feeding
Wells I 0 0 0 5% No spray recommended
Wells II 1 0 0 2% No spray recommended

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage:  30% or more of plants scouted show injury.
Pre-tassel-silk:  15% or more of plants scouted show injury.
Silk:  5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

Sweet Corn IPM Newsletter No. 4 – July 19, 2013

Friday, July 19th, 2013

Sweet Corn

Sweet Corn IPM Newsletter No. 4 – July 19, 2013

For full page print version, please see link at the bottom. Click on photos to enlarge.

INSECT ACTIVITY LOW TO MODERATE THIS WEEK

Stalled Weather Pattern Means Little Change to Pest Situation

SITUATION
Most fields did not see significant rain this week; in fact some southern and northern fields are starting to run dry. The heat has pushed corn development rapidly and a couple of early fields are just ready for harvest. Some later plantings look a bit spotty, with uneven development due to the extended cool, wet weather following planting. Generally, insect activity has been light to moderate this week, with several fields not requiring any additional protection. A predicted change in the weather pattern next week may bring about some changes in pest activity as well.

European corn borer:  Moth catches have declined to very low numbers this week, with most farms having no moths in the traps. A silking field in Charleston was the exception with 19 moths, exceeding the threshold of 5 moths per week in traps, but all of this sites are also on a spray schedule for corn earworm, so no additional sprays should be required. European corn borer feeding damage was over threshold in pre-tassel fields in North Berwick and Warren this week.

European Corn Borer Larva

European Corn Borer Larva, photo by David Handley

Corn Earworm Moth

Corn Earworm Moth, photo by David Handley

Corn earworm:  Moth counts were generally low in southern Maine this week and many locations did not require protection. In the more northern sites, counts were higher, and more frequent sprays were needed on silking corn. A 4-day spray interval was recommended for Charleston and Garland. A 5-day spray interval was recommended for Levant. A 6-day spray interval was recommended for silking fields in Cape Elizabeth, Hollis and Farmington.

Fall Armyworm Moths

Fall Armyworm Moths (female right, male left), photo by James Dill

Fall armyworm:  A slight increase in fall armyworm moth activity was seen this week.  Single moths were caught in seven locations this week including Auburn, Biddeford, Farmington, Dayton, Nobleboro, Oxford and Wells. At one field in New Gloucester, five moths were caught, exceeding the three-moth threshold for the week, so a spray for all silking corn was recommended. We have found very little fall armyworm feeding damage in younger corn fields, but we expect that levels will be increasing soon.

Squash vine borer moths were caught in pheromone traps in North Berwick, Wells, Hollis, Biddeford, Gray, and New Gloucester this week. The threshold of five moths per week was exceeded in North Berwick, Hollis, Gray and New Gloucester. Be aware that this pest is now active and threatens summer squash, winter squash and pumpkins.  See the New England Vegetable Management Guide for control options.

Highmoor Farm Highmoor Farm Fruit and Vegetable Growers Field Day July 31, 2013
Please join us for the Highmoor Farm Field Day and Summer Tour to be held on Wednesday, July 31, starting at 9:00 a.m. Growers will have an opportunity to tour the fruit and vegetable research plots at the farm, part of the Maine Agricultural and Forest Experiment Station, and hear Extension specialists and guest speakers discuss current research on apples, grapes and vegetables. Maine State Legislators will also be on hand to offer updates on programs and legislation effecting farming in Maine.  Please join us for the program, farm tours and lunch.

Registration fee is $20 per person, including lunch and preregistration is strongly encouraged. Visit the Field Day website for more information. If you are a person with a disability and will need any accommodations to participate in this program, please call Pam St. Peter at Highmoor Farm, 207.933.2100 or TDD 1.800.287.8957 to discuss your needs at least 7 days prior to this event.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259        Orono, ME  04473
207.933.2100                          1.800.287.0279

Sweet Corn IPM Weekly Scouting Summary

Location CEW
Moths
ECB
Moths
FAW
Moths
%Feeding
Damage
Recommendations / Comments
Auburn 0 0 1 6% No spray recommended
Biddeford 1 0 1 14% No spray recommended
Cape Elizabeth I 1 0 0 7% No spray recommended
Cape Elizabeth II 2 0 0 6-day spray interval recommended on all silking corn
Charleston 9 19 0 2% 4-day spray interval recommended on all silking corn
Dayton 1 0 1 4% No spray recommended
Farmington 2 0 1 1% 6-day spray interval recommended on all silking corn
Garland 11 2 0 0% 4-day spray interval recommended on all silking corn
Gray 0 1 0 3% No spray recommended
Hollis 2 0 0 6-day spray interval recommended on all silking corn
Levant 5 0 0 1% 5-day spray interval recommended on all silking corn
Lewiston 0 0 0 0% No spray recommended
New Gloucester 0 0 5 One spray recommended on silking corn for FAW
Nobleboro 0 0 1 No spray recommended
No. Berwick 0 0 0 32% One spray recommended for ECB feeding
Oxford 0 0 1 4% No spray recommended
Palmyra 0 4 0 No spray recommended
Wales 0 1 0 6% No spray recommended
Warren 1 0 0 25% One spray recommended for ECB feeding
Wells I 0 0 0 2% No spray recommended
Wells II 0 1 1 6% No spray recommended

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage: 30% or more of plants scouted show injury.
Pre-tassel-silk: 15% or more of plants scouted show injury.
Silk: 5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

Sweet Corn IPM Newsletter No. 3 – July 12, 2013

Friday, July 12th, 2013

Sweet Corn

Sweet Corn IPM Newsletter No. 3 – July 12, 2013

For full page print version, please see link at the bottom. Click on photos to enlarge.

EARLY SILKING CORN THREATENED BY CORN EARWORM

European Corn Borer also Active, Fall Armyworm Activity Low

SITUATION
Yet more rain in southern Maine
this week has kept fields wet and slowed growth, but more early planted fields are now coming into silk and first harvest is within sight. Insect activity has increased in most locations, and any silking corn is now threatened by both European corn borer and corn earworm.    

European Corn Borer Trap

European Corn Borer Trap, photo by David Handley

European Corn Borer Larvae on Pre-tassel Stage Corn

European Corn Borer Larvae on Pre-tassel Stage Corn, photo by David Handley

European corn borer:  Moth catches continue to be somewhat erratic this week, but most sites had relatively low counts. Silking fields in Gray, North Berwick and Sabattus were over the threshold of 5 moths per week in traps, but all of these sites are also on a spray schedule for corn earworm, so no additional sprays should be required.  European corn borer feeding damage was over threshold in pre-tassel fields in Biddeford, Cape Elizabeth, and Warren this week. We expect to see more late fields exceeding feeding injury in later plantings in the coming week.  Sprays applied at pre-tassel tend to be more effective than whorl or tassel stage sprays, because the larvae are usually more exposed.  

Corn Earworm Moth

Corn Earworm Moth, photo by David Handley

Corn earworm:  Moths are now being caught at most locations, but many fields do not yet have silking corn and so are not yet threatened by corn earworm. A 6-day spray interval was recommended for early silking fields in Dayton, Gray, No. Berwick, Oxford, Sabattus and Wells. A 5-day spray interval was recommended for silking fields in Farmington, Garland, and Nobleboro, where moth counts were slightly higher. A 4-day spray interval was recommended for one silking field in Cape Elizabeth where the highest moth count of the season was found this week.  

Fall armyworm:  Single moths were caught in two locations this week (Farmington, Lewiston). At this time fall armyworm is not a threat to silking corn. We have not found any fall armyworm feeding damage in younger corn fields, but we anticipate that it will be showing up soon.

Squash vine borer moths were caught in pheromone traps in North Berwick, Biddeford, Gray, New Gloucester and Nobleboro. The threshold of five moths per week was only exceeded in North Berwick, but growers should be aware that the pest is now active and threatens summer squash, winter squash and pumpkins. See the New England Vegetable Management Guide for control options.

Late Blight on Tomato Leaf

Late Blight on Tomato Leaf, photo by James Dill

Late Blight:  Grower and Farm Stand Alert
Late blight has been found on potato plants in northern Maine this week. This follows recent reports of late blight in tomato and potato plantings in New York and Massachusetts and many southern coastal states. Growers should be alert to catch early symptoms and be ready to apply appropriate control measures. Typical symptoms will be water-soaked lesions on the leaves with fine, white cottony mycelium on the undersides. Infections on the stems appear as dark, almost black lesions. Visit Cornell University Cooperative Extension’s web pages for photos of tomatoes and potatoes.  Please report any suspicious symptoms to the Pest Management Office 581.3883 (1.800.287.0279), or email PMO@umext.maine.edu.   

Reminder:  Highmoor Farm Field Day and Summer Tour will be held on Wednesday, July 31, 2013 from 9:00 a.m. to 4:00 p.m. Registration fee is $20 per person, including lunch, and preregistration is strongly encouraged. For more information, visit the Highmoor Farm website or call 207.933.2100. If you are a person with a disability and will need any accommodations to participate in this program, please call Pam St. Peter at Highmoor Farm, 207.933.2100 or TDD 1.800.287.8957 to discuss your needs at least 7 days prior to this event.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth
, ME  04259        Orono, ME  04473
207.933.2100                          1.800.287.0279

Sweet Corn IPM Weekly Scouting Summary

Location CEW
Moths
ECB
Moths
FAW
Moths
%Feeding
Damage
Recommendations / Comments
Auburn 5 2 0 10% No spray recommended (no silking corn)
Biddeford 1 1 0 63% One spray recommended for ECB
Cape Elizabeth I 1 2 0 3% No spray recommended
Cape Elizabeth II 43 2 0 77% 4-day spray interval recommended on all silking corn
Charleston 14 8 0 7% No spray recommended (no silking corn)
Dayton 3 1 0 1% 6-day spray interval recommended on all silking corn
Farmington 4 1 1 5-day spray interval recommended on all silking corn
Dayton 0 0 0 0 No spray recommended
Garland 7 0 0 3% 5-day spray interval recommended on all silking corn
Gray 3 23 0 6-day spray interval recommended on all silking corn
Levant 4 2 0 0% No spray recommended (no silking corn)
Lewiston 0 0 1 2% No spray recommended
Livermore Falls 1 1 0 4% No spray recommended
New Gloucester 1 2 0 2% No spray recommended
Nobleboro 6 2 0 5-day spray interval recommended on all silking corn
No. Berwick 3 13 0 6-day spray interval recommended on all silking corn
Oxford 3 3 0 6-day spray interval recommended on all silking corn
Palmyra 0 8 0 2% No spray recommended
Sabattus 2 12 0 6-day spray interval recommended on all silking corn
Wales 0 0 0 0% No spray recommended
Warren 1 0 0 20% One spray recommended for ECB
Wells I 2 0 0 0% No spray recommended (no silking corn)
Wells II 3 4 0 4% 6-day spray interval recommended on all silking corn

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage: 30% or more of plants scouted show injury.
Pre-tassel-silk: 15% or more of plants scouted show injury.
Silk: 5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

 

Sweet Corn IPM Newsletter No. 2 – July 8, 2013

Tuesday, July 9th, 2013

Sweet Corn

Sweet Corn IPM Newsletter No. 2 – July 8, 2013

For full page print version, please see link at the bottom. Click on photos to enlarge.

EUROPEAN CORN BORER, CORN EARWORM MOTHS ACTIVE

Silking Corn Needs Protection in Early Fields

SITUATION
Warm conditions and lots more rain have kept corn growing, but made it difficult to do any field work, such as spraying or side-dressing. Early fields in some areas are showing silk, and later fields, although uneven, are coming into pre-tassel. Some growers have had difficulty getting onto wet ground to seed their last plantings. The rain also is raising concerns about fertilizer and herbicide leaching.

European corn borer:  Moth catches were irregular this week with about half of the sites having any moths caught, and just a few over threshold for early fields with silking corn. Activity may increase over the next week, as the wet weather might extend the emergence of this first generation of moths. European corn borer feeding damage was over threshold in pre-tassel fields in Biddeford, Cape Elizabeth, Livermore Falls, and Nobleboro this week. One field (No. Berwick) that had both silking corn and was over threshold for moths was also put on a spray program for corn earworm, so no additional sprays were required.

European Corn Borer Damage

European Corn Borer Damage, photo by David Handley

Corn Earworm Moth

Corn Earworm Moth, photo by David Handley

Corn earworm:  About one half of the fields visited this week had corn earworm moths in pheromone traps. Most of these fields do not yet have any silking corn, so no sprays were recommended. When more than one corn earworm moth is found at a site, all silking corn in the fields should be protected with a spray. Additional sprays are based on the average number of moths caught per week or per night (see table below). Silking fields in Dayton, No. Berwick and Wells were recommended to go on a 6-day spray program for silking corn this week, based on a weekly capture of 3 moths.

Male Fall Armyworm Moth

Male Fall Armyworm Moth, photo by David Handley

Fall armyworm:  We have caught a couple of fall armyworm moths in pheromone traps this week, although the identification has not been confirmed. We have not yet seen any feeding damage from this pest, so no sprays for fall armyworm have been recommended.

Squash vine borer moths are being caught in pheromone traps in southern Maine. The moths lay their eggs at the base of squash or pumpkin plants, and the larvae tunnel into the vines, causing them to wilt and collapse. Entry holes can often be found near the base of the plant.  Sprays can be applied to control the moths and prevent egg-laying. Plow down squash plantings as soon as harvest is complete to prevent borers from overwintering in the field. There is one generation per year. See the New England Vegetable Management Guide for more details.

Japanese beetles are becoming plentiful in southern and mid-state areas. These insects often find their way into corn fields and may feed on the silks of developing ears, causing poor tip fill. Sprays for corn earworm (except Bt’s) will often control Japanese beetle as well.

Japanese Beetle

Japanese Beetle, photo by Edwin Remsberg, USDA

Male and Female Spotted Wing Drosophila Flies

Male (left) and Female (right) Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

Spotted wing drosophila:  We have had our first captures of spotted wing drosophila in New Hampshire and Maine this week. These small fruit flies can cause serious fruit losses in raspberries, blueberries and other soft fruits. The flies will only attack fruit that has begun to ripen, and we don’t expect populations to reach damaging levels for a few weeks. For more information visit the Highmoor Farm website.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259        Orono, ME  04473
207.933.2100                          1.800.287.0279

Sweet Corn IPM Weekly Scouting Summary

Location CEW
Moths
ECB
Moths
FAW
Moths
%Feeding
Damage
Recommendations / Comments
Auburn 0 7 0 8% No spray recommended (no silking corn)
Biddeford 0 2 0 42% One spray recommended for ECB on pre-tassel corn
Cape Elizabeth I 0 0 0 3% No spray recommended
Cape Elizabeth II 6 12 1 20% One spray recommended for ECB on pre-tassel corn
Dayton 3 1 1% 6-day spray interval recommended on all silking corn
Farmington 2 1 0 2% No spray recommended
Lewiston 0 0 0 0% No spray recommended
Livermore Falls 1 0 0 28% One spray recommended for ECB on pre-tassel corn
New Gloucester 0 0 1 0% No spray recommended
Nobleboro 2 11 0 18% No spray recommended (no silking corn)
No. Berwick 3 13 0 6-day spray interval recommended on all silking corn
Oxford 1 1 0 6% No spray recommended (no silking corn)
Warren 0 0 0 4% No spray recommended
Wells I 2 0 0 0% No spray recommended (no silking corn)
Wells II 3 4 0 4% 6-day spray interval recommended on all silking corn

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage:  30% or more of plants scouted show injury.
Pre-tassel-silk:  15% or more of plants scouted show injury.
Silk:  5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.