Dr. Fei Yang – Extension Corn Entomologist, University of Minnesota Department of Entomology, and Bruce Potter – Potter Bros., LLC
It was a much quieter week for black cutworm (BCW) moth migration. Nevertheless, significant captures occurred May 6-9 into Rock County and May 7-8 into Renville County (Figure 1).
Warm temperatures should push faster development of black cutworm larvae. Scouting for leaf feeding and possible cutting should be underway in high risk fields.
Larvae from the earliest mid-April moth arrivals could reach the 4th instar stage and able to cut small corn as soon as May 20. These larvae should cease feeding and being to pupate in mid-June.
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| Figure 1. Black cutworm moth captures May 3 – 9, 2025. Color shading represents the maximum two-night captures for trap(s) in the county. |
Warm temperatures should push faster development of black cutworm larvae. Scouting for leaf feeding and possible cutting should be underway in high risk fields.
Larvae from the earliest mid-April moth arrivals could reach the 4th instar stage and able to cut small corn as soon as May 20. These larvae should cease feeding and being to pupate in mid-June.
Several trap sites across southern Minnesota also reported armyworm moth captures, but these numbers continue to be low.
Report #6 includes BCW leaf feeding and cutting projections, economic thresholds and recommended management strategies.
Read this week's full report
Information on moth arrivals earlier this spring can be found in previous 2025 UMN Cooperative Black Cutworm Trapping Network Reports. These along with previous year's reports and other black cutworm information are on the Black Cutworm Reporting Network.
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