Skip Navigation
Return to Layout View | Home | A-Z Directory | my UMaine | MaineStreet | Campus Map | Calendar
Follow UMaine on Twitter | Join UMaine on Facebook | Watch UMaine on YouTube | Admissions | Parents & Family | Apply | Give Now | Emergency

Cooperative Extension at Highmoor Farm


Site Navigation:


Spotted Wing Drosophila Update: 8/15/2014

SPOTTED WING DROSOPHILA UPDATE: 8/15/2014

Click on photo to enlarge.

David Handley, Vegetable & Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Although spotted wing drosophila captures remain relatively low through most of the state, we are finding the flies in more locations this week. We caught single flies in traps in Wells, Mechanic Falls, Springvale, Fayette and Wales. Two to six flies were caught in our traps in Limington, Gray, Cape Elizabeth, Turner, Bowdoinham, Dresden, Livermore Falls, Farmington, Monmouth, Thorndike, and Burnham. Although we have not yet caught more than six flies in a week at any site, any more than one fly in two consecutive weeks would be cause to recommend a spray to protect any ripening fruit in that location.

Recent weather fronts have been moving into Maine from the south. This may cause a sudden increase in spotted wing drosophila numbers, because we strongly suspect that the flies can travel up on storm fronts.

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.

Image Description: Spotted Wing Drosophila Larvae in Raspberry

Sweet Corn IPM Newsletter No. 8 – August 15, 2014

Sweet Corn IPM Newsletter No. 8 – August 15, 2014

Click on photos to enlarge.

PEST NUMBERS INCREASE IN MOST FIELDS

Fall Armyworm, European Corn Borer Moth Counts Rising

SITUATION
The recent storm has caused lodging in some fields, but corn plants can often come back up if the roots have not been badly damaged. However, spraying and harvesting lodged corn can be difficult. The stream of weather coming up from the south will likely cause pest numbers to increase in the near future, although for this week we have only seen relatively moderate increases in fall armyworm and European corn borer moth captures. The latter may indicate that a second generation is now getting underway.

European corn borer: Moth counts were generally higher in most locations this week, although a few sites still had no moths in the traps. This increase in trap captures suggests that a second generation of corn borer may be underway and could threaten silking corn in fields that are not on a spray schedule for corn earworm. Sabattus, Farmington, Livermore Falls, Nobleboro, Oxford and Palmyra were over the threshold of 5 moths per week in silking corn. The Farmington and Palmyra sites were also on spray regimes for corn earworm, so no additional sprays should be needed there. European corn borer feeding damage in pre-tassel corn was over the 15% threshold in Biddeford, Cape Elizabeth, Dayton, Poland Spring and Warren this week.

Corn earworm: Corn earworm moth counts are rising in some locations, as we expect late in the season when more weather comes up from the south carrying moths with it. A 6-day spray interval was recommended for corn earworm on silking fields in Biddeford, one Dayton site, Farmington, Palmyra, Warren, and one Wells site. A 5-day spray interval was recommended for one Cape Elizabeth site, Charleston, one Dayton site, New Gloucester, and North Berwick. A 4-day spray interval was recommended at one Lewiston site.

Fall armyworm: Moth counts continue to be erratic around the state, but were significantly higher in some sites this week (nearly 100 moths in a Cape Elizabeth trap). Fields in Biddeford, Cape Elizabeth, Monmouth, Nobleboro, Wales, Warren and one Wells site exceeded the threshold of 3 moths per week in silking corn. However, only the Monmouth, Nobleboro and Wales sites were not on a spray regime for corn earworm. Fall armyworm feeding damage on plants was only noted in Cape Elizabeth this week, where it exceeded the 15% damage threshold.

Squash vine borer moths were caught in pheromone traps in Biddeford and Cape Elizabeth this week, but did not exceed the threshold of five moths per week. You can download a free copy of the University of New Hampshire’s new fact sheet, Managing Squash Vine Borer Problems in New Hampshire from their website.

Picnic beetles can become a problem during the late summer on silking corn. These beetles are about 1/4 inch long, black with orange spots. They can often be found on stalks and ears that are infested with European corn borer or fall armyworm, feeding on sap at an entry or exit hole. They are also known to feed on the silks. While this does little damage, customers may object to finding the insects in their bags. Sprays to control corn earworm should provide control of these beetles if they are found in your field.

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
Biddeford 2 0 5 22% 6-day spray interval recommended on all silking corn
Cape Elizabeth I 1 0 2 13% No spray recommended
Cape Elizabeth II 6 2 97 50% 5-day spray interval recommended on all silking corn
Charleston 5 4 0 5-day spray interval recommended on all silking corn
Dayton I 3 0 0 6-day spray interval recommended on all silking corn
Dayton II 6 0 1 38% 5-day spray interval recommended on all silking corn
Farmington 2 10 1 6-day spray interval recommended on all silking corn
Levant 1 3 0 3% No spray recommended
Lewiston I 9 3 0 0% 4-day spray interval recommended on all silking corn
Lewiston II 0 0 0 3% No spray recommended
Livermore Falls 1 5 1 0% One spray recommended for ECB on silking corn
Monmouth 0 4 18 One spray recommended for FAW on silking corn
New Gloucester 6 1 0 8% 5-day spray interval recommended on all silking corn
Nobleboro 1 35 8 One spray recommended for ECB+FAW on silking corn
No. Berwick 7 0 0 7% 5-day spray interval recommended on all silking corn
Oxford 1 7 2 2% One spray recommended for ECB on silking corn
Palmyra 2 6 0 6-day spray interval recommended on all silking corn
Sabattus 0 81 0 One spray recommended for ECB on silking corn
Wales 1 0 6 6% One spray recommended for FAW on silking corn
Warren 2 3 27 35% 6-day spray interval recommended on all silking corn
Wells I 0 0 0 4% No spray recommended
Wells II 2 1 3 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.

The University of Maine is an equal opportunity/affirmative action institution.

Image Description: Sweet Corn

Image Description: European Corn Borer Larvae on Pre-tassel Stage Corn

Image Description: Corn Earworm Larvae

Image Description: Two Squash Vine Borer Moths

Image Description: Sap beetle on strawberry

Dill Quoted in AP Article on Berry Growers’ Fruit Fly Battles

James Dill, a pest management specialist with the University of Maine Cooperative Extension, was quoted in an Associated Press article about Northeast berry growers learning how to combat an invasive fruit fly — the tiny spotted-wing drosophila — that wiped out 80 percent of some farms’ late-season fruit two years ago. Growers in Maine, the country’s largest producer of wild blueberries, are spraying and harvesting sooner and planting earlier varieties, the article states. “You take a loss, but the loss is on green berries rather than having to put more pesticides out there,” Dill said. The Portland Press Herald, Yahoo! News and Fox Business carried the AP report.

Spotted Wing Drosophila Update: 8/8/2014

SPOTTED WING DROSOPHILA UPDATE: 8/8/2014

Click on photos to enlarge.

David Handley, Vegetable & Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Spotted wing drosophila captures remain low throughout most of the state this week. No flies were found at most of our trap sites. We caught single flies in traps in Levant, Limington, Buxton and Gray. We caught six flies in our Turner locations, the most we have caught in a single week this season, and enough that we would recommend a spray to protect any ripening fruit in that location. We have not yet had any reports of fruit infested with larvae. Other New England states continue to report captures of spotted wing drosophila in traps, but counts have been low.

If the population growth of spotted wing drosophila follows a similar trend as the past two years, we expect populations to start to build rapidly in the next two to three weeks. Check traps every couple of days for the spotted wings of the male flies. Start protective sprays on any berries that have begun to ripen once more than one spotted wing drosophila is caught in a trap in a week, or any larvae are noticed in the fruit. Look for fruit flies hovering around fruit and symptoms of premature fruit decay.

Products that provide good control of drosophila on berries include Delegate®, Brigade®, Bifenture®, Danitol®, Mustang Max®, malathion and Assail®. 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.

We have a new supply of the spotted wing drosophila fact sheet series from Pennsylvania State University covering, biology, identification and management. Contact us if you would like copies.

A simple monitoring trap for spotted wing drosophila:
The trap body is made from a 16 ounce red plastic cup (we use Solo Brand P16RLR). You’ll need one that has a tight fitting lid (we use Solo Brand 626TS). Using a 1/8” hole punch (available through art suppliers) punch about 15 holes in a row around the cup just under the lip about 1/2” apart. Leave about 2” of the diameter of the rim with no holes so that liquid can be poured in and out. Punch a second row of holes just under the first row, to give you a total of 30, 1/8” holes. Use a black permanent marker to paint a 1/2” wide black strip around the cup under the rim, right over the holes you punched. To support the trap, cut a wooden tomato stake down to about 30”. Attach a 4” or larger hose clamp near the top of the stake to act as a cup holder for the trap (we just punched a hole in the metal band of the hose clamp and attached it to the stake with a flat headed wood screw). Place the trap holder in a shady, moist place in or near the fruit planting, with the cup height about 18” off the ground. Fill the trap with 4 to 6 ounces of apple cider vinegar, water + sugar + yeast, or whatever bait you prefer. It is best to add a few drops of unscented soap to break the surface tension of the liquid. Place the lid on the cup to keep rain and critters from getting in, and place the trap in the holder. Adjust the hose clamp so that the trap fits in snugly but the trap holes are not covered up. Empty and re-bait the trap every week. Do not pour out the old bait on the ground near the trap, as this will draw flies away from it.

David T. Handley
Vegetable and 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.

Image Description: Male and Female Spotted Wing Drosophila Flies

Image Description: drosophila trap

Sweet Corn IPM Newsletter No. 7 – August 8, 2014

Sweet Corn IPM Newsletter No. 7 – August 8, 2014

Click on photos to enlarge.

PEST PRESSURE VARIABLE – HIGHER ALONG THE COAST

Fresh Silking Corn Requires Protection

SITUATION
So far, so good – the weather has been offering enough heat, sunshine and moisture to keep corn growing well, although the recent supply has been a bit spotty due to earlier weather issues. Pest numbers remain relatively moderate for this late in the season, although silking corn in most locations still requires protection against corn earworm and/or fall armyworm.

European corn borer: Moth counts were higher in a few locations this week, although many sites still had few or no moths in the traps. Sabattus, Farmington and Lewiston sites were over the threshold of 5 moths per week in silking corn, but the Farmington and Lewiston sites were also on spray regimes for corn earworm, so no additional sprays should be needed. European corn borer feeding damage in pre-tassel corn was only over the 15% threshold in Poland Spring and Wales this week.

Corn earworm: Corn earworm moth counts are still moderate for this time in the season, with many sites not presently requiring a spray, although numbers were higher in some coastal locations this week. A 6-day spray interval was recommended for corn earworm on silking fields in Farmington, Garland, Lewiston, Nobleboro, Wales, and one Wells site. A 5-day spray interval was recommended for Biddeford. A 4-day spray interval was recommended in Cape Elizabeth, Charleston, Levant, and Warren.

Fall armyworm: Moth counts were higher in some sites along the coast, but many sites caught no moths this week. Fields in Biddeford, Cape Elizabeth, Dayton, Levant, North Berwick and Warren exceeded the threshold of 3 moths per week in silking corn. However, only the Dayton and North Berwick sites were not on a spray regime for corn earworm. Fall armyworm feeding damage on plants was only noted in Biddeford this week, but did not exceed the 15% damage threshold.

Squash vine borer moths were caught in pheromone traps only in Cape Elizabeth this week, but it was below the threshold of five moths per week. The University of New Hampshire has just released a new fact sheet called Managing Squash Vine Borer Problems in New Hampshire, based on their experience with this pest over the past few seasons. You can download a copy of it free from their webpage.

Powdery mildew has been found on cucumbers, squash and pumpkins around the state. There are new varieties with resistance to powdery mildew and several new fungicides for managing it. See the New England Vegetable Management Guide for details. Start fungicide applications when symptoms (gray powdery spots on leaves) are just beginning to develop or when fruit are starting to enlarge. The IPM action threshold is 1 of 50 older leaves with symptoms. Look at the lower as well as upper surface of leaves when scouting. Use a 14-day spray interval with resistant varieties; 7-day with other varieties. Lists of resistant varieties are available on Cornell University’s 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
Biddeford 5 1 6 4% 5-day spray interval recommended on all silking corn
Bowdoinham 0 0 0 1% No spray recommended
Cape Elizabeth 13 0 5 4% 4-day spray interval recommended on all silking corn
Charleston 17 2 2 4-day spray interval recommended on all silking corn
Dayton 1 1 3 0% One spray recommended for FAW on silking corn
Farmington 2 5 1 6-day spray interval recommended on all silking corn
Garland 2 0 0 0% 6-day spray interval recommended on all silking corn
Levant 9 0 3 1% 4-day spray interval recommended on all silking corn
Lewiston 2 5 0 0% 6-day spray interval recommended on all silking corn
Livermore Falls 1 0 1 1% No spray recommended
Monmouth 0 1 1 7% No spray recommended
Nobleboro 2 0 0 6-day spray interval recommended on all silking corn
No. Berwick 0 0 3 2% One spray recommended for FAW on silking corn
Oxford 0 0 1 1% No spray recommended
Palmyra 1 3 0 6% No spray recommended
Poland Spring 0 2 0 17% One spray recommended for ECB feeding damage
Sabattus 1 31 0 0% One spray recommended for ECB on silking corn
Wales 2 0 0 22% 6-day spray interval recommended on all silking corn
Warren 15 1 17 2% 4-day spray interval recommended on all silking corn
Wells I 2 0 1 0% 6-day spray interval recommended on all silking corn
Wells II 0 1 1 0% 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.

The University of Maine is an equal opportunity/affirmative action institution.

Image Description: Sweet Corn

Image Description: European Corn Borer Holes

Image Description: Corn Earworm Moth

Image Description: Male Fall Armyworm Moth

Image Description: Powdery Mildew on Pumpkin Leaf

Spotted Wing Drosophila Update: 8/1/2014

SPOTTED WING DROSOPHILA UPDATE: 8/1/2014

Click on photos to enlarge.

David Handley, Vegetable & Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Spotted wing drosophila captures continued to be low and erratic this week. No spotted drosophila were found at most of our trap sites; but we also caught four flies in our Turner and Wales locations, the most we have caught in a single week this season. We caught two flies in traps in Thorndike and Farmington this week, and single flies in traps in Bowdoinham, Warren and Livermore Falls. We have not yet had any reports of fruit infested with larvae. The other New England states are all now reporting captures of spotted wing drosophila in traps; but like us, the counts have been low.

If the population growth of spotted wing drosophila follows a similar trend as the past two years, we expect populations to start to build rapidly in the next two to three weeks, especially if conditions remain warm and humid. Set out traps, if you haven’t already, and examine them every couple of days. Start protective sprays on any berries that have begun to ripen, once more than one spotted wing drosophila is caught in a trap, or any larvae are noticed in the fruit. Look for fruit flies hovering around fruit and symptoms of premature fruit decay.

Products that provide good control of drosophila on berries include Delegate®, Brigade®, Bifenture®, Danitol®, Mustang Max®, malathion and Assail®. 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.

We have a new supply of the spotted wing drosophila fact sheet series from Pennsylvania State University covering, biology, identification and management. Contact us if you would like copies.

A simple monitoring trap for spotted wing drosophila:
The trap body is made from a 16 ounce red plastic cup (we use Solo Brand P16RLR). You’ll need one that has a tight fitting lid (we use Solo Brand 626TS). Using a 1/8” hole punch (available through art suppliers) punch about 15 holes in a row around the cup just under the lip about ½” apart. Leave about 2” of the diameter of the rim with no holes so that liquid can be poured in and out. Punch a second row of holes just under the first row, to give you a total of 30, 1/8” holes. Use a black permanent marker to paint a ½” wide black strip around the cup under the rim, right over the holes you punched. To support the trap, cut a wooden tomato stake down to about 30”. Attach a 4” or larger hose clamp near the top of the stake to act as a cup holder for the trap (we just punched a hole in the metal band of the hose clamp and attached it to the stake with a flat headed wood screw). Place the trap holder in a shady, moist place in or near the fruit planting, with the cup height about 18” off the ground. Fill the trap with 4 to 6 ounces of apple cider vinegar, water + sugar + yeast, or whatever bait you prefer. It is best to add a few drops of unscented soap to break the surface tension of the liquid. Place the lid on the cup to keep rain and critters from getting in, and place the trap in the holder. Adjust the hose clamp so that the trap fits in snugly but the trap holes are not covered up. Empty and re-bait the trap every week. Do not pour out the old bait on the ground near the trap, as this will draw flies away from it.

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

 

Image Description: Male and Female Spotted Wing Drosophila

Image Description: drosophila trap

Sweet Corn IPM Newsletter No. 6 – July 31, 2014

Sweet Corn IPM Newsletter No. 6 – July 31, 2014

Click on photos to enlarge.

PEST PRESSURE MODERATE AS CORN HARVEST BEGINS

Corn Earworm and Fall Armyworm Counts Low, but Still Threaten Silking Corn

SITUATION
Corn harvest is getting into full swing in southern Maine. High winds associated with the numerous thunderstorms have caused minor lodging in some fields. Excessive rainfall may also result in poor herbicide performance and leaching of fertilizer, especially nitrogen. Pest numbers remain relatively moderate, although silking corn in most locations requires protection against corn earworm and/or fall armyworm.

European corn borer: Moth counts continue to decline this week, suggesting that the first generation of this insect may be coming to an end. Most sites had no moths in the traps. Only the Sabattus site was over the threshold of 5 moths per week in silking corn. European corn borer feeding damage was only over the 15% threshold in Wales.

Corn earworm: Corn earworm remains widely distributed but moth counts are still moderate. A 6-day spray interval was recommended for corn earworm on silking fields in Dayton, Garland, Gray, Monmouth, Wales, New Gloucester, Nobleboro, North Berwick, Oxford and Palmyra. A 5-day spray interval was recommended for Biddeford, one Cape Elizabeth site, Charleston, Levant, Lewiston, Sabattus, Warren and one Wells location.

Fall armyworm: Moth counts are variable around the state this week. Fields in Biddeford, Cape Elizabeth, Dayton, Garland, Levant, Lewiston, Monmouth and Warren exceeded the threshold of 3 moths per week in silking corn. However, only the Garland site and one Lewiston site were not on a spray regime for corn earworm. Feeding damage on plants was only noted in New Gloucester this week, but did not exceed the 15% damage threshold.

Squash vine borer moths were caught in pheromone traps in Biddeford, Dayton, New Gloucester and Wells this week. The threshold of five moths per week was exceeded at the Biddeford, Dayton and New Gloucester sites. Vine borers threaten summer squash, winter squash and pumpkins. See the New England Vegetable Management Guide for control options.

Corn Rust: Rust is a fungus disease that causes reddish-brown pustules to form on the leaves, stalks and husks, reducing the visual quality of the ears. Severe infections can reduce ear size, especially if they occur prior to tasseling. Typically, corn rust does not become a problem until late in the season, because it can’t overwinter in Maine and must move in from the south. A fungicide spray for rust would only be recommended if the infection were noticed in a field prior to tasseling. Later infections are unlikely to cause enough damage to the crop to justify control measures. Materials available to control corn rust include Bravo®, Quilt® and maneb/mancozeb.

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
Biddeford 4 4 11 6% 5-day spray interval recommended on all silking corn
Bowdoinham 0 0 0 0% No spray recommended
Cape Elizabeth I 7 2 3 0% 5-day spray interval recommended on all silking corn
Cape Elizabeth II 0 1 43 One spray recommended for FAW on silking corn
Charleston 6 0 0 5-day spray interval recommended on all silking corn
Dayton 3 0 5 6-day spray interval recommended on all silking corn
Farmington 0 0 0 0% No spray recommended
Garland 2 0 5 2% 6-day spray interval recommended on all silking corn
Gray 3 0 0 13% 6-day spray interval recommended on all silking corn
Levant 4 0 5 3% 5-day spray interval recommended on all silking corn
Lewiston I 7 0 4 3% 5-day spray interval recommended on all silking corn
Lewiston II 0 0 4 One spray recommended for FAW on silking corn
Livermore Falls 0 0 0 1% No spray recommended
Monmouth 2 1 12 9% 6-day spray interval recommended on all silking corn
New Gloucester 2 0 0 3% 6-day spray interval recommended on all silking corn
Nobleboro 2 0 6-day spray interval recommended on all silking corn
No. Berwick 3 0 0 6-day spray interval recommended on all silking corn
Oxford 2 0 1 8% 6-day spray interval recommended on all silking corn
Palmyra 2 2 0 5% 6-day spray interval recommended on all silking corn
Sabattus  0  12  1  1% One spray recommended for ECB on silking corn
Wales  3  0  1  20%  6-day spray interval recommended on all silking corn
Warren 5 0 8 1% 5-day spray interval recommended on all silking corn
Wells I 1 0 0 0% No spray recommended
Wells II 5 0 2 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.

The University of Maine is an equal opportunity/affirmative action institution.

 

Image Description: Sweet Corn

Image Description: Wind Blown Corn Field

Image Description: Adult Fall Armyworm

Image Description: Squash Vine Borer Larva

Image Description: Rust on Corn

Sweet Corn IPM Newsletter No. 5 – July 28, 2014

Sweet Corn IPM Newsletter No. 5 – July 28, 2014

Click on photos to enlarge.

EARLY CORN HARVEST UNDERWAY

Pest Pressure Remains Moderate for Most Locations

SITUATION
Hot weather and adequate moisture have provided good growing conditions for corn. Early harvest is underway in southern Maine and many fields are now silking, meaning they are now more susceptible to all of the major corn pests. However, in spite of a recent spate of storm fronts from the west, pest numbers have remained relatively moderate in most locations.

European corn borer: With the exception of two northern sites, moth counts were very low this week. Most sites had no moths in the traps. However, silking fields in Levant and Palmyra were over the threshold of 5 moths per week in silking corn. The Levant site was also on a spray regime for corn earworm, so no additional spray was recommended. European corn borer feeding damage was over threshold in pre-tassel to tasseling fields only at our Biddeford site this week.

Corn earworm: While corn earworm was widely distributed throughout our sites this week, moth counts were moderate. However, many later planted fields are now coming into silk and will need to be protected. A 6-day spray interval was recommended for corn earworm on silking fields in North Berwick, Wells, Biddeford, Cape Elizabeth, Bowdoinham, Gray, Farmington, one Lewiston site and Charleston. A 5-day spray interval was recommended for one Dayton site and one Lewiston site, Sabattus, Warren, Nobleboro and Levant.

Fall armyworm: Moth counts were higher in a few locations this week. Fields in Cape Elizabeth, Garland, Lewiston, Monmouth and Nobleboro exceeded the threshold of 3 moths per week in silking corn. However, only the Garland site was not also on a spray regime for corn earworm. Feeding damage on plants was noted this week in fields in Biddeford, Cape Elizabeth and Sabattus. Although not yet over threshold on it’s own, when combined with European corn borer damage the total feeding exceeded the 15% threshold in Biddeford.

Squash vine borer moths were caught in pheromone traps in Biddeford, Oxford and Wells this week. The threshold of five moths per week was exceeded only at the Wells site. Vine borers threaten summer squash, winter squash and pumpkins. See the New England Vegetable Management Guide for control options.

Potato leafhopper alert: We are seeing signs of potato leafhopper in vegetable and strawberry fields this week. These small, bullet-shaped insects feed on plant sap from the undersides of leaves, causing the leaves to become curled, stunted and yellow-streaked. Beans are often the first crop to show symptoms, but other crops are also susceptible, including potatoes and strawberries. To scout for leafhoppers, brush the leaves of the plants with your hand. The small, whitish adults can be seen flying off the plant. Look for small, light green leafhopper nymphs on the underside of injured leaves. They are about 1/16 inch long. When touched, they will crawl sideways in a crab-like manner. Controls for potato leafhoppers are listed in the New England Vegetable Management Guide.

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
Biddeford 2 0 2 17% 6-day spray interval recommended on all silking corn
Bowdoinham 3 0 1 4% 6-day spray interval recommended on all silking corn
Cape Elizabeth I 3 0 3 6% 6-day spray interval recommended on all silking corn
Cape Elizabeth II 3 0 12 2% 6-day spray interval recommended on all silking corn
Charleston 2 0 0 6-day spray interval recommended on all silking corn
Dayton I 0 0 0 No spray recommended
Dayton II 6 0 0 12% 5-day spray interval recommended on all silking corn
Farmington 2 0 2 1% 6-day spray interval recommended on all silking corn
Garland 1 0 5 0% One spray recommended for FAW on silking corn
Gray 3 0 0 6-day spray interval recommended on all silking corn
Levant 4 6 0 2% 5-day spray interval recommended on all silking corn
Lewiston I 5 0 10 5% 5-day spray interval recommended on all silking corn
Lewiston II 3 0 2 6-day spray interval recommended on all silking corn
Livermore Falls 0 0 0 0% No spray recommended
Monmouth 1 2 11 No spray recommended (no silking corn)
Nobleboro 5 0 3 1% 5-day spray interval recommended on all silking corn
No. Berwick 2 0 0 6-day spray interval recommended on all silking corn
Oxford 1 0 1 2% No spray recommended
Palmyra 1 19 1 3% One spray recommended for ECB on silking corn
Sabattus 5 2 0 13% 5-day spray interval recommended on all silking corn
Wales 1 0 2 0% No spray recommended
Warren 7 0 2 0% 5-day spray interval recommended on all silking corn
Wells I 3 0 0 3% 6-day spray interval recommended on all silking corn
Wells II 1 0 0 0% 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.

The University of Maine is an equal opportunity/affirmative action institution.

Image Description: Sweet Corn

Image Description: Corn Earworm

Image Description: Fall Armyworm on Corn Silk

Image Description: Two Squash Vine Borer Moths

Image Description: Potato Leafhopper

Spotted Wing Drosophila Update: 7/24/2014

 

SPOTTED WING DROSOPHILA UPDATE: 7/24/2014

Click on photos to enlarge.

David Handley, Vegetable & Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Spotted wing drosophila (SWD) captures continue to be low this week. Single female flies were caught in traps in Buxton, Turner and Thorndike this week. A single male SWD was caught in Turner. We also have reports of flies being caught in New Hampshire, Connecticut and New York, but also in relatively low numbers.

We expect populations to start to build rapidly in the coming weeks as more food (fruit) becomes available for the flies, especially if conditions remain warm and humid. Now is the time to set out traps, if you haven’t already. Start protective sprays on any berries that have begun to ripen once more than one spotted wing drosophila is caught in a trap, or any larvae are noticed in the fruit. Look for fruit flies hovering around fruit and symptoms of premature fruit decay.

Last year, populations did not reach damaging levels until late August; but weather conditions can alter how quickly the flies will build up. Frequently repeated insecticide sprays (1 to 3 times per week) are often needed to prevent infestations once the insect is present in a field. Products that provide good control of drosophila on berries include Delegate®, Brigade®, Bifenture®, Danitol®, Mustang Max®, malathion and Assail®. Research 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. 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.

There is a good fact sheet series on management of spotted wing drosophila from Penn State Extension at: http://extension.psu.edu/plants/vegetable-fruit/fact-sheets/spotted-wing-drosophila-1.

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.

Image Description: Male Spotted Wing Drosophila

Image Description: Spotted Wing Drosophila Larvae in Blueberry

Sweet Corn IPM Newsletter No. 4 – July 18, 2014

Sweet Corn IPM Newsletter No. 4 – July 18, 2014

Click on photos to enlarge.

CORN EARWORM COUNTS CLIMBING

Pest Pressure Now Moderate for Most Locations

SITUATION
Despite a series of storms coming up from the south, corn pest pressure has remained moderate in most locations this week. Harvest of early corn planted under plastic will likely start next week in southern Maine.

European corn borer:  Moth counts were erratic again this week, with some locations having the highest numbers of the season, while others had none. Silking fields in Dayton, Lewiston, Livermore Falls, Nobleboro and Sabattus were over the threshold of 5 moths per week in silking corn. The Lewiston, Nobleboro and Sabattus sites were also on a spray regime for corn earworm, so no additional spray was recommended. European corn borer feeding damage was over threshold in pre-tassel to tasseling fields in Biddeford, Nobleboro, North Berwick and Sabattus this week.

Corn earworm:  Most locations have now caught at least one corn earworm moth, and counts have risen in a few locations this week. But moth numbers are still relatively low in many fields, given the recent storms moving in from the south. A 6-day spray interval was recommended for corn earworm on silking fields in one Cape Elizabeth location, one Dayton location, Gray, New Gloucester, Nobleboro, North Berwick, Sabattus and one Wells location. A 5-day spray interval was recommended for one Cape Elizabeth site and one Lewiston site. A 4-day spray interval for silking corn was recommended for Wales and Warren.

Fall armyworm:  Moth counts were mostly very low this week. Only one site in Cape Elizabeth exceeded the threshold of 3 moths per week in silking corn. However, this field was also on a spray regime for corn earworm, so no additional sprays should be needed. Feeding damage on plants was noted this week in fields in Biddeford, North Berwick and one Wells site. Although not yet over threshold on it’s own, when combined with European corn borer damage the total feeding exceeded the 15% threshold.

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

Squash vine borer moths were caught in pheromone traps in Biddeford, Cape Elizabeth, Dayton, New Gloucester and Wells this week. This week’s counts were some of the highest we’ve seen. The threshold of five moths per week was exceeded in Dayton, New Gloucester and Biddeford.  Vine borers threaten summer squash, winter squash and pumpkins. See the New England Vegetable Management Guide for control options.

Late Blight Update:  Infections have been confirmed from potatoes in commercial fields and home gardens in southern Maine. With hot, humid weather, this disease can spread rapidly through a region. Growers should scout their potato and tomato fields for symptoms and apply preventative fungicides. For more information visit our Cooperative Extension Publications website and the 2014-2015 New England Vegetable Management Guide.

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
Biddeford 0 1 1 18% One spray recommended for ECB + FAW feeding
Cape Elizabeth I 2 3 0 5% 6-day spray interval recommended on all silking corn
Cape Elizabeth II 4 0 10 5-day spray interval recommended on all silking corn
Charleston 0 0 1 No spray recommended
Dayton I 0 7 0 One spray recommended for ECB on silking corn
Dayton II 2 0 1 11% 6-day spray interval recommended on all silking corn
Farmington 1 2 1 2% No spray recommended
Garland 1 0 0 0% No spray recommended
Gray 2 1 0 6-day spray interval recommended on all silking corn
Levant 0 2 0 0% No spray recommended
Lewiston I 6 5 0 5-day spray interval recommended on all silking corn
Lewiston II 1 3 0 0% No spray recommended
Livermore Falls 1 12 0 2% One spray recommended for ECB on silking corn
Monmouth 1 0 0 No spray recommended
New Gloucester 2 0 1 1% 6-day spray interval recommended on all silking corn
Nobleboro 3 5 0 29% 6-day spray interval recommended on all silking corn
No. Berwick 2 0 0 41% 6-day spray interval recommended on all silking corn
Oxford 0 4 0 1% No spray recommended
Palmyra 0 2 0 0% No spray recommended
Sabattus 3 8 0 23% 6-day spray interval recommended on all silking corn
Wales 8 1 0 0% 4-day spray interval recommended on all silking corn
Warren 9 0 1 4-day spray interval recommended on all silking corn
Wells I 0 2 0 8% No spray recommended
Wells II 2 2 1 2% 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.

Image Description: Sweet Corn

Image Description: European Corn Borer Damage on Pre-tassel Stage corn

Image Description: Corn Earworm Moth

Image Description: Fall Armyworm Eggs on Corn

Image Description: Japanese Beetle

Image Description: Two Squash Vine Borer Moths

Image Description: Late Blight on Potato Leaf


Sidebar

University of Maine Cooperative Extension


Contact Information

Cooperative Extension at Highmoor Farm
52 U.S. Route 202
Monmouth, Maine 04259-0179
Phone: 207.933.2100
The University of Maine
Orono, Maine 04469
207.581.1110
A Member of the University of Maine System