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How to Manage Pests

Key to Aphids Most Commonly Found in San Joaquin Valley Alfalfa and Cotton

| Start key | Management guidelines: Alfalfa | Cotton |

Based on the key characteristics, the aphid is likely to be

Pea aphid (Acrythosiphon pisum)

Photo of pea aphid adult and nymphs.
Click on photo to enlarge

Find out more about pea aphid on

Note: A pink-colored biotype of the pea aphid occurs in France, on the east coast and in several western states of the U.S. including California. It is infrequently encountered in the field. Biologically, it behaves identically to the green form found in California, including its response to resistant cultivars.

Statewide IPM Program, Agriculture and Natural Resources, University of California
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