 Colony of bean aphids Bean Aphid Mature aphids are dark olive-green to black, 2 to 2.5 mm long, with alternating white and dark areas on the legs. Immature aphids are uniformly gray-green to olive-green. Bean aphids are common on sugarbeets and beans. They cause damage by sucking plant juices and weakening the plants. Host plants: dock, beans, corn, sugarbeets, snowball bush, lambsquarters, pigweed.
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