Twenty-six sites reported this week. European corn borer (ECB)-E was caught at 6 sites and ECB-Z was also caught at 6 sites. Corn earworm was caught at 20 sites, with 18 sites showing counts high enough to warrant a 4, 5, or 6-day spray schedule (refer to the table below). Fall armyworm (FAW) was caught at 4 sites, and Western bean cutworm (WBC) was caught at 13 sites.
Average sweet corn trap catches from 5.30.23– 8.29.23
Often at this time of year we are catching CEW at most locations and in high enough numbers that other moths will be controlled by the spray timing needed for CEW. In the absence of CEW, continue to scout for ECB and FAW egg masses, larvae and feeding damage, using a threshold of 15% infested plants in tassel emergence stage fields and 5% in silk stage fields.
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- ECB egg mass
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- ECB feeding damage on leaves.
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- ECB larva in tassel
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- Fall armyworm egg mass.
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- Fall armyworm feeding damage and frass.
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- Fall armyworm larva, note the inverted ‘Y’ om head capsule.
Table showing trap catch for 8.22.23 – 8.29.23.
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