ISU field crop specialist Mark Carlton (south central Iowa) reported fall armyworm infestations on oats seeded with alfalfa and also on rye. We also got a call last Friday from a crop consultant reporting seedling alfalfa damage. It seemed that the oats (rye in the Friday call) were being eaten first, but that the alfalfa seedlings were taking a beating in spots. This type of damage is unusual, and we have no set thresholds for fall armyworm on seedling alfalfa.
Iowa State University
Pope, Richard O., "Fall armyworm on seedling alfalfa" (1998). Integrated Crop Management News. 2266.
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