This article was originally posted by the Purdue Cooperative Extension. Numbers vary considerably from field to field. Recent cooler temperatures favored aphid development. Treatment threshold and application guidelines given below. Soybean aphids have begun to show up in a few northern Indiana soybean fields, some are reportedly over threshold. Because of the tremendous variability in aphid numbers from field to field, diligent scouting NOW can pay big dividends. Aphids are relatively easy to scout for, identify and (for now at least) can be readily controlled using a variety of relatively inexpensive insecticides. The following is a quick scouting review: [...]