The invasion of soybean aphid, Aphis glycines Matsumura, into the North Central Region has changed soybean, Glycine max (L.), production practices. In addition, growers are noticing persisting aphid populations in corn, Zea mays L., too. A combination of aphid species are likely to develop on corn, including corn leaf aphid, Rhopalosiphum maidis (Fitch), and bird cherry-oat aphid, Rhopalosiphum padi (L.). Developing accurate management recommendations for aphids is difficult because of the complicated life cycle.