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Armyworm and Black Cutworm Trapping Network (07/15/21)


Trap catches are summarized in Table 1. Armyworm numbers have stabilized and black cutworm numbers continue to be low. There was one report of high densities of armyworm (2-5 per square foot) in an irrigated wheat field near Park Rapids, MN. These larvae were small, about ¼ inch long and were early instars. Economic threshold is 2 larvae per square foot after wheat has headed. The grower was expecting 60-80 bu/acre wheat, so the wheat field was treated for armyworms.

Table 1. Summary of pheromone trap catches for true armyworm and black cutworm in wheat, 2021.


Janet J. Knodel

Extension Entomologist