Seventeen of the 32 monitoring sites submitted reports this week.

• European corn borer E (ECB-E) was caught at one site.

• ECB-Z was found at five sites.

• The ECB hybrid was detected at one site.

• Corn earworm (CEW) was reported at seven sites.

• No fall armyworm (FAW) were caught this week.

• Western bean cutworm (WBC) have not been reported at any sites except Tivoli, which has now recorded captures for a second consecutive week.

Several sites have accumulated enough degree days to indicate the peak spring flight of ECB. This is the time to begin scouting your sweet corn fields for signs of eggs, larvae, or feeding damage. When scouting, focus on the emerging tassel. Gently pull apart the leaves and look deep into the tassel for any signs of:

• Feeding damage

• Frass (insect waste)

• Larvae presence

The threshold for ECB, CEW, and FAW is 15% of plants infested at tassel emergence.  To assist with scouting:

• Watch our video: How to Scout Fresh Market Sweet Corn

• Use the accompanying Sweet Corn Scouting Form (PDF)

If you need additional help learning how to scout, feel free to contact me:

Marion Zuefle
Email: mez4@cornell.edu
Phone: 315-787-2379

J.W. Apple, Department of Entomology, University of Wisconsin-Madison

Table showing trap catch for 6.10.25 – 6.17.25.

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