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This is a somewhat abbreviated issue, due to the Labor Day holiday and a much reduced scouting team this week. In addition, it does not include the potential impact of the remains of hurricane Isaac, which are passing over Maine today. Although insect counts have been very low for this time of year, the passing of a tropical storm can bring with it a significant population of corn pests, especially corn earworm and fall armyworm, so we should anticipate higher pressure by the end of the week for any fresh silking corn remaining in the field.
European corn borer: Moth counts are very low this week with only one site in Cape Elizabeth exceeding the 5-moth threshold for silking corn, but the site is also on a spray schedule for corn earworm, so no additional sprays are needed. Feeding damage was also low. Only a North Berwick field exceeded the 15% threshold when combined with fall armyworm damage.
Corn earworm: Moth counts were at low to moderate levels this week, although we anticipate increased activity due to the tropical storm remnants passing through Maine today. A 4-day spray interval for fresh silking corn was recommended for one Dayton location and Nobleboro. A 5-day spray interval was recommended for Cape Elizabeth, Dayton, New Gloucester, North Berwick,Wayne and Warren. A 6-day spray interval was recommended for Biddeford, Charleston, Jefferson, Monmouth, Wales and Wells.
Fall armyworm: Most fields are now in silk and under spray schedules for corn earworm, so very little feeding damage is being noted. Only one North Berwick field was over the threshold when combined with ECB feeding damage. Moth captures remain low for this time of year, with no sites exceeding the spray threshold of 3 moths in silking corn. Single moths were caught in Biddeford, Cape Elizabeth, Monmouth, New Gloucester, and Warren.
The Food Safety Modernization Act (FSMA) and Its Possible Effects on Maine’s Specialty Crop Growers
AgMatters LLC cordially invites you to attend a workshop about this important new legislation. Joy Johanson from the Produce Safety staff with the FDA will give an overview of FSMA and the Produce Safety Rule. Representatives from the Maine Board of Pesticides Control will address Worker Protection Training and a new law requiring Pesticide Licensing of all growers. Lauchlin and Linda Titus from AgMatters LLC will share their impressions on the future of Maine’s Specialty Crop Markets and suggestions on how growers can capitalize on changes in the industry. Please register for one of the following times and locations:
Tuesday, September 11, 2012
10:00 AM to 2:00 PM
Bangor Motor Inn, 701 Hogan Rd., Bangor (Exit 187 off Interstate 95)
Wednesday, September 12, 2012
10:00 AM to 2:00 PM
Ramada Inn, 490 Pleasant St., Lewiston (Exit 80 off Interstate 95)
Please RSVP as soon as possible by phone 873.2108 or by email to firstname.lastname@example.org.
David T. Handley
Vegetable & Small Fruit Specialist
Highmoor Farm Pest Management Office
P.O. Box179 491 College Ave
Monmouth,ME 04259 Orono,ME 04473
|Location||CEW Moths||ECB Moths||FAW Moths||%Feeding Damage||Recommendations / Comments|
|Biddeford||2||0||1||8%||6-day spray interval for all silking corn|
|Cape Elizabeth I||5||5||0||All silking||5-day spray interval for all silking corn|
|Cape Elizabeth II||5||1||1||4%||5-day spray interval for all silking corn|
|Charleston||3||2||0||All silking||6-day spray interval for all silking corn|
|Dayton I||15||0||0||All silking||4-day spray interval for all silking corn|
|Dayton II||6||0||0||All silking||5-day spray interval for all silking corn|
|Jefferson||3||0||0||All silking||6-day spray interval for all silking corn|
|Monmouth||2||1||1||All silking||6-day spray interval for all silking corn|
|New Gloucester||5||0||1||All silking||5-day spray interval for all silking corn|
|Nobleboro||14||1||0||All silking||4-day spray interval for all silking corn|
|No. Berwick||7||0||0||All silking||5-day spray interval for all silking corn|
|Sabattus||0||0||0||All silking||No spray recommended|
|Wales||2||0||0||All silking||6-day spray interval for all silking corn|
|Warren||5||2||1||All silking||5-day spray interval for all silking corn|
|Wayne||4||0||0||All silking||5-day spray interval for all silking corn|
|Wells I||2||0||0||All silking||6-day spray interval for all silking corn|
|Wells II||3||0||0||All silking||6-day spray interval for 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.
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.
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Image Description: Sweet Corn
Image Description: Corn Earworm Moth
Image Description: Male Fall Armyworm Moth