Since 2010, aphids have been colonizing corn later in the summer and are building up to striking levels in Iowa. They can be found at the base of the stalk, around the ear and sometimes above the ear leaf. It seems these aphids have been sighted in corn again this summer (Photo 1).
Iowa State University
Hodgson, Erin W., "Check Your Corn for Aphids" (2018). Integrated Crop Management News. 2484.
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