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Soybean aphid colony: An apterous soybean aphid, Aphis glycines, colony with a tending ant. (Photo Marlin E. Rice)Soybean aphids: A coloby of apterous soybean aphids, Aphis glycines, on a soybean stem with a tending ant. (Photo Marlin E. Rice)

Aphids in soybeans are usually identified as being small (less than 1 mm) and either with or without wings. Their most distinguishing characteristic are the cornicles; the "tail pipes" projecting from the rear of the abdomen.

The pea aphid: The pea aphid, <em>Acyrthosiphon pisum</em>, on an alfalfa plant. Colonies of this aphid are not found on soybean because soybean is not an acceptable host for this pest species.Pea aphid: The pea aphid, Acyrthosiphon pisum, is common on alfalfa in Iowa where forms large colonies. Colonies of this aphid do not occur on soybean because it is not an acceptable host for this pest species. (Photo Marlin E. Rice)

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