How to Manage Pests

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

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

Cowpea aphid (Aphis craccivora)

Note: In cotton, the cowpea aphid is not expected to become a major pest, but it is included here because it may be confused with the dark form of the cotton aphid.