Thistle caterpillars are being reported in soybeans in southern and western Iowa. Extension crop specialists Mark Carlton (Albia) and Clark McGrath (Lewis) both report finding them in their areas. The thistle caterpillar is a sporadic pest of Iowa soybeans.
Iowa State University
Rice, Marlin E., "Thistle caterpillars -- mostly minor pests of soybeans" (2005). Integrated Crop Management News. 1469.
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