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Cooperative Extension at Highmoor Farm


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Sweet Corn IPM Newsletter No. 13 – September 5, 2012

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

CORN EARWORM REMAINS LOW…  FOR NOW…

Fall Armyworm and European Corn Borer also Remain Scarce

SITUATION
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)
Tel. 207.947.0355

Or

Wednesday, September 12, 2012
10:00 AM to 2:00 PM
Ramada Inn, 490 Pleasant St., Lewiston (Exit 80 off Interstate 95)
Tel. 207.784.2331

Please RSVP as soon as possible by phone 873.2108 or by email to ltitus21@myfairpoint.net.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                      Pest Management Office
P.O. Box179                          491 College Ave
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 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.

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.

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Image Description: Male Fall Armyworm Moth


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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