Sweet Corn IPM Weekly Scouting Reports

Corn earworm

By monitoring sweet corn pests throughout the state and making the results of that monitoring available to corn growers each week, UNH Cooperative Extension helps growers implement IPM plans, reduce pesticide use, and produce quality crops.

UNHCE monitors sweet corn insect pests on thirty-four NH farms each week throughout the growing season. We trap and monitor European Corn Borer, Corn Earworm, Fall Armyworm, and Western Bean Cutworm. Scouting results are posted here weekly so that growers can easily monitor the corn pest levels at farms near to them and can make management decisions based on these numbers.

Our traps are put out in early May and are monitored weekly through the end of the corn harvest (usually October or the first killing frost). Traps are baited with pheromones lures which attract corn pest moths. An IPM Scout from UNH Cooperative Extension visits each trap weekly, counts the number of moths caught, and enters that data here for use by NH farmers.

The table below gives a snapshot of the number of moths caught over the past week in monitoring traps. The numbers presented here provide an indication to you of the population levels of corn pests at farms nearby, but be aware that conditions vary dramatically from one farm to another. Trapping at your own farm is the best way of knowing what is happening in your crop. Our factsheet, Setting up Traps to Monitor Sweet Corn Insects in New Hampshire, provides instruction on how to set up and use your own monitoring traps. For a pictorial guide in identification of trapped moths, see our factsheet, Identifying Moths in Traps for Sweet Corn Pests.

Treatment of a crop is recommend when trap counts reach the threshold numbers reported below the table.

In addition to monitoring moths in traps, we also monitor feeding damage and the crop growth stage on which damage is seen.  Monitoring feeding damage on your crop can provide more information on which to base management decisions, and can help you evaluate how well your management actions are working.  For a guide in identification of feeding stages of corn pests, see our factsheet Identifying Common Sweet Corn Caterpillars.

Data from previous weeks is available through the drop down menu below the table.

Watch this page for alerts of population spikes, weather patterns that could cause population spikes, and other notable events that may affect your management decisions.

UNH Cooperative Extension’s crop insect monitoring programs are made possible through support from the NH Department of Agriculture, Markets and Food’s IPM grant program.