![]() ![]() The MSU factsheet mentioned above states: “There are no thresholds for winter cutworm in hay fields, but we suggest following guidelines for armyworm management (4 to 6 per square foot).Copyright © 2014 - 2023 Farmer's Business Network, Inc. That said, if you are finding areas of cutworm activity, it may be worth checking winter small grains, alfalfa and grass hay fields fields for potential above ground cutworm feeding. Field assessments would help identify and, if needed, help prioritize fields for potential replanting after snow melt. I was not able to find much on assessing risk or management specifics. I have not heard reports of winter cutworms being an economic concern in NY. In Michigan, feeding was reported on alfalfa and grass hay, Swiss chard, squash, and sugar beets.” “The host range of Noctua pronuba is wide and includes beets, cabbage, carrot, grape, grasses, lettuce, potato, strawberry, and tomato as well as numerous ornamental plants and weeds. Thus if a large cutworm-like caterpillar is found late in the fall or during the winter, it is likely Noctua pronuba.” However, unlike other caterpillar species winter cutworm is very cold tolerant, emerging even in the winter to feed. In large numbers, caterpillars move across fields and roads, similar to armyworm. They are closely related to other cutworm species found in agricultural fields, feeding at the base of plants and sometimes moving up onto foliage. ![]() Note: These caterpillars are not true armyworms.įrom the Michigan State Factsheet: “Noctua pronuba caterpillars are sometimes called winter or snow cutworms. Caterpillars active this time of year are likely to be the Winter Cutworm ( Noctua pronuba) also called “Snow Cutworms” or Yellow Underwing larvae. On warmer days caterpillars, about + 1 inch in length, have been seen crawling across lawns, roads, grass hay and even snow covered areas. Jason Dombroski, Cornell Entomology’s insect identification diagnostician has also been receiving calls regarding these insects. ![]() Several calls have come in recently from across the state regarding caterpillar activity in lawns, roads, yards and fields. MaWinter cutworm being eaten by Boxelder bug (Diagnostic Services at Michigan State University) New York State Integrated Pest Management Program ![]()
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