As noted in the May 28, 2001, Integrated Crop Management newsletter, alfalfa fields should have been scouted for variegated cutworms following the first cutting. Variegated cutworms are now causing a delay in alfalfa regrowth in scattered locations across Iowa. Some cutworms are nearly full grown at 11/4-11/2 inches but others are only 5/8-3/4 inch in length. These smaller cutworms will continue to feed for another 21-24 days, depending on weather conditions. Large areas of fields or areas that were under windrows that have not regrown should be scouted for variegated cutworms.
Iowa State University
Rice, Marlin E., "Variegated cutworms delay alfalfa" (2001). Integrated Crop Management News. 1987.
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