For The
Week Ending
mm/dd/yy
Corn Earworm*
# caught
for week
Fall Armyworm*
European Corn Borer*
# caught for week
ECB I
(NY strain)*
ECB II
(IA strain)*
* Not all sites have all types of insect traps
For Sweet Corn
Corn Earworm (CEW) 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 six days
3.6 to 7.0
0.6 to 1.0
Spray every five days
7.1 to 91
1.1 to 13.0
Spray every four days
More than 91
More than 13
Spray every three 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.
Fall Armyworm (FAW) Spray Thresholds for Pheromone traps
If silking corn is not being sprayed for other pests, such as corn earworm, a spray is recommended if more than three moths are caught in a trap within a week.
European Corn Borer (ECB) Spray Thresholds for Pheromone traps
In silking corn that has not yet been sprayed for corn earworm, a treatment is recommended to protect the silks from egg-laying ECB moths if five or more moths are caught in the pheromone traps in a week.
These IPM Projects are being partially funded through the New Hampshire Department of Agriculture, Markets and Foods - Integrated Pest Management Grant Program.
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