Noted: This year in Wisconsin, a fall armyworm population is present unlike anything most entomologists have ever seen. The pests are doing damage to alfalfa, winter wheat and other cover crops around the state. Bryan Jensen, UW-Extension Pest Management Specialist, shares that this warmer fall weather has helped to create a perfect storm for fall armyworms to thrive. Fall armyworms are different from the normal armyworms seen during late spring. The good news, according to Jensen, is they will most definitely not over-winter here in Wisconsin: they are a warm weather species, and will not survive the winter
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