If sweet corn is pre-row tassel or later, treat with an insecticide. If the catches consist of females, eggs have already been deposited. Retreat every 5-7 days until silks brown. Split stalks below entrance holes and remove borers. A small braconid wasp, Macrocentrus grandi , and a tachinid fly, Lydella stabulans grisecens , are natural enemies of the European corn borer.
Pheromones are available for monitoring European corn borer.
Apply in evening when fewer bees are working. Because pesticide labels can change rapidly, you should read the label directions carefully before buying and using any pesticides. Regardless of the information provided here, you should always follow the latest product label when using any pesticide. If you have any doubt, please contact your local Extension agent or pesticide dealer for the latest information on pesticide label changes. Commercial products named on this site are for informational purposes only.