Archive for the ‘News’ Category

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.

 

Series: Understanding and Managing Soils for Healthy Productive Crops

Friday, August 30th, 2013

When: Tuesday evenings, 6:00 – 8:00 PM, October 1, 8, 15, 22, and 20, 2013

Where: Conference Room, UMaine Extension Knox and Lincoln County Office, 377 Manktown Road, Waldoboro, Maine 04572

Cost:  $40 per person for the series, or $10 per session. Preregistration is required.

This five-part series is designed for both experienced and new farmers to gain a solid understanding of farm soils and how to best manage them for long-term healthy and productive soils. Please visit the posting on the UMaine Agricultural Programs website for more information.

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.

Fruit Growers Alert 8/16/13: Spotted Wing Drosophila Spreading, Counts Increasing

Monday, August 19th, 2013

Fruit Growers Alert – August 16, 2013

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

SPOTTED WING DROSOPHILA SPREADING, COUNTS INCREASING

Spotted Wing Drosophila Trap

SWD Trap, photo by David Handley

Spotted wing drosophila (SWD) flies were captured in traps in Bowdoinham, Cape Elizabeth, Dresden, Gray, Limington, Livermore Falls, Mechanic Falls, Monmouth, New Gloucester, Springvale, Wales, Warren and Wells.  Trap captures varied this week from just one fly to over 100, with most catching fewer than 10.  There are now just a few sites where we haven’t yet caught any flies.   The Bowdoinham site again had far more flies than any other location (135) although this was only about ½ the number we caught at the same location last week. The other sites with higher numbers were Wells (21) and Wales (18).  Some of this variation may just be a matter of where the traps are placed at each site.  Ideally, growers should set up their own traps to monitor for SWD, and learn to distinguish it from other species that will get into the trap.

Male and Female Spotted Wing Drosophila

Male and Female Spotted Wing Drosophila, image by Alan Kenage, Capital Press

While there is no valid threshold for spotted wing drosophila in berry fields (most buyers have zero tolerance), growers should initiate a regular insecticide spray program once SWD is captured in your area and you have ripe or nearly ripe fruit in your fields. Recommended insecticide   products that provide good control of drosophila on berries include Delegate®, Brigade®, Bifenture®, Danitol®, Mustang Max®, malathion and Assail®.  Effectiveness of these products can range from three to seven days.  Repeated applications throughout the harvest season may be required to prevent larvae from infesting the fruit.  Please check product labels for rates, post-harvest intervals and safety precautions. Keeping the fields clean of over-ripe and rotten fruit can also help reduce the incidence of this insect.

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

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.

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.

Fruit Growers Alert 8/9/13: Spotted Wing Drosophila Populations Jump in Coastal Site

Monday, August 12th, 2013

Fruit Growers alert – August 9, 2013

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

SPOTTED WING DROSOPHILA POPULATIONS JUMP IN COASTAL SITE

Spotted wing drosophila (SWD) flies were captured in traps in Wells, Cape Elizabeth, Limington, New Gloucester, Gray, Monmouth, Bowdoinham and Corinna. Most traps had one to three flies in them, and there are still a few locations where we have not caught any flies. The exception was the Bowdoinham site, which had over 200 flies for the week. We had no data from our Dresden site, which is close by, this week (broken trap) but the count was higher there last week as well.

There have been more reports of maggots in blueberry fruit this week, but these are the larvae of was blueberry fruit fly (aka blueberry maggot), not spotted wing drosophila, as we reported last week. Blueberry maggot populations of this insect have been very high this season, and any plantings that were not sprayed as fruit began to ripen are susceptible to infestation. For a good fact sheet on this pest visit our web site. If you are finding larvae in harvested blueberry fruit, there is a fact sheet from North Carolina State University website to help identify which insect is causing the problem.

Spotted Wing Drosophila Larva in Blackberry

SWD Larvae in Blackberry, photo by David Handley

Spotted Wing Drosophila Maggot in Raspberry

SWD Larva in Raspberry, photo by David Handley

There is no valid threshold for spotted wing drosophila in berry fields. If SWD has been captured in your area and you have ripe or nearly ripe fruit in your fields, the crop should be protected with a recommended insecticide. Products that provide good control of drosophila on berries include Delegate®, Brigade®, Bifenture®, Danitol®, Mustang Max®, malathion and Assail®. Effectiveness of these products can range from three to seven days. Repeated applications throughout the harvest season may be required to prevent larvae from infesting the fruit. Please check product labels for rates, post-harvest intervals and safety precautions. Keeping the fields clean of over-ripe and rotten fruit can also help reduce the incidence of this insect.

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

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.

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.

Fruit Growers Alert 8/2/13: Spotted Wing Drosophila Populations Remain Low

Friday, August 2nd, 2013

Fruit Growers Alert – August 2, 2013

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

SPOTTED WING DROSOPHILA POPULATIONS REMAIN LOW

Spotted wing drosophila (SWD) flies were captured in traps in Wells, Dresden, New Gloucester and Bowdoinham this week. Trap captures continue to be fairly low, with many locations not yet recording any flies.  We’re still seeing higher numbers near the coast and in the south, with nine flies caught in Dresden, six in New Gloucester and three in both Wells and Bowdoinham.

We have had several reports of maggots in blueberry fruit this week, but in each case the pest was blueberry fruit fly (aka blueberry maggot), not spotted wing drosophila.  Blueberry maggot is a common pest of blueberries in Maine and populations of this insect have been very high this season, according to Frank Drummond, Professor of Entomology at the University of Maine.

For a good fact sheet on this pest, visit our web site. If you are finding larvae in harvested blueberry fruit, there is a fact sheet on the North Carolina State University website to help identify which insect is causing the problem.

There is no valid threshold for spotted wing drosophila in berry fields.  At this point we believe that if any SWD have been captured in your area and you have ripe or nearly ripe fruit in your fields, the crop should be protected with a recommended insecticide.

Spotted Wing Drosophila Trap with One Male SWD Circled

Spotted Wing Drosophila Trap, Male SWD Circled, photo by Kaytlin Woodman

Spotted wing drosophila poses the greatest threat to raspberries, blackberries, blueberries and other soft fruit that is beginning to ripen (elderberries, peaches, nectarines, etc.). Products that provide good control of drosophila on berries include Delegate®, Brigade®, Bifenture®, Danitol®, Mustang Max®, malathion and Assail®. Research carried out at the Connecticut Agricultural Experiment Station suggests that adding table sugar to group 4A insecticides such as Assail®, may improve their effectiveness. The recommended rate would be 1-2 lbs. sugar per 100 gallons of spray. Effectiveness of these products can range from three to seven days.  Repeated applications throughout the harvest season will likely be required to prevent larvae from infesting the fruit.  Please check product labels for rates, post-harvest intervals and safety precautions. Keeping the fields clean of over-ripe and rotten fruit can also help reduce the incidence of this insect.

For information on identifying spotted wing drosophila and making your own monitoring traps, visit the Michigan State University’s Spotted Wing Drosophila website.  There is also a good fact sheet series on Management of Spotted Wing Drosophila from Penn State on their website.

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

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.

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.

Fruit Growers Alert 7/26/13: Spotted Wing Drosophila Activity Spreading

Monday, July 29th, 2013

Fruit Growers Alert – July 26, 2013

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

SPOTTED WING DROSOPHILA ACTIVITY SPREADING

Spotted Wing Drosophila Trap

SWD Trap, photo by David Handley

Spotted wing drosophila (SWD) flies were captured in traps in Wells, Warren, Dresden, New Gloucester, Monmouth, Union and Lincolnville this week. These trap captures indicate that SWD has become active in more regions of the state. Most trap captures have been very low to date (1 to 3 flies), but some sites near the coast have seen higher numbers this week. A trap in Dresden caught seven flies. One trap in Warren caught 13 flies while another caught 84.  SWD populations are also rising in the other New England states this week, according to reports from Massachusetts, New Hampshire and Connecticut.

There is no valid threshold for spotted wing drosophila in berry fields. At this point we believe that if any SWD have been captured in your area and you have ripe or nearly ripe fruit in your fields, the crop should be protected with a recommended insecticide.

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 poses the greatest threat to raspberries, blackberries, blueberries and other soft fruit that is beginning to ripen (elderberries, peaches nectarines, etc.). Products that provide good control of drosophila on berries include Delegate®, Brigade®, Bifenture®, Danitol®, Mustang Max®, malathion and Assail®. Research carried out at the Connecticut Agricultural Experiment Station suggests that adding table sugar to group 4A insecticides such as Assail®, may improve their effectiveness. The recommended rate would be 1-2 lb. sugar per 100 gallons of spray. Effectiveness of these products can range from three to seven days. Repeated applications throughout the harvest season will likely be required to prevent larvae from infesting the fruit. Please check product labels for rates, post-harvest intervals and safety precautions. Keeping the fields clean of over-ripe and rotten fruit can also help reduce the incidence of this insect.

For information on identifying spotted wing drosophila and making your own monitoring traps, visit the Michigan State University’s Spotted Wing Drosophila website. There is also a good fact sheet series on Management of Spotted Wing Drosophila from Penn State on their website.

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. For more information and to register online, visit the Field Day website.

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

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.