University of Maryland Extension

Maryland Corn Earworm Moth Map

Author: 
Andrew Kness
Maryland moth map screenshot

If you’re spraying non-GMO corn to manage corn earworm, then check out our new website for monitoring populations at www.mdmothmap.com. There you’ll find up-to-date catch counts for pheromone traps located across Maryland. Just click on a pin to display the most recent 5-day total. These 5-day totals are used to calculate your recommended spray interval, which you can see by clicking “Spray Rate” in the top right corner of the page. This website also works on mobile devices.

If moth populations are high enough to warrant an insecticide application, be sure to use products that have efficacy and be sure to rotate modes of action in order to reduce the development of resistance. Some earworm populations are developing resistance to pyrethroids (Group 3A insecticides). Consult your local Extension Agent for more information, or reference the Mid-Atlantic Commercial Vegetable Production Recommendations for a list of effective insecticides. Always be sure to read and follow all pesticide labels before application. It should also be noted that GMO hybrids with the Vip3A protein provide nearly 100% control of corn earworm, which you may want to consider for future crops.

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