Reports received: 26 of 34 monitoring sites submitted data this week.
Trap catches this week:
- European corn borer (ECB-E): reported at 8 sites
- European corn borer (ECB-Z): reported at 3 sites
- Corn earworm (CEW): reported at 17 sites, 13 high enough to be on a 4,5, or 6 day spray schedule
- Fall armyworm (FAW): reported at 2 sites
- Western bean cutworm (WBC): reported at 6 sites
If corn is in the tassel emergence stage use a threshold of 15%. When scouting look for ECB, FAW and WBC egg masses on the leaves. FAW egg masses consist of 50-150 eggs and can be distinguished from ECB by the fine hairs covering the egg mass. Feeding damage is also very different from ECB. FAW will cause ragged feeding damage on leaves with large amounts of frass below the feeding site. The larva has a distinct inverted ‘Y’ on the front of the head (see pictures below).
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- Fall armyworm egg mass.
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- Fall armyworm damage
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- Fall armyworm larva, note the inverted ‘Y’ om head capsule.
J.W. Apple, Department of Entomology, University of Wisconsin-Madison
Table showing trap catch for 7.1.25 – 7.8.25.
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