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How to Manage Pests

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

From "antennal tubercles are diverging"

Click on the illustration or description that best describes the aphid.

comparison of length of cauda and cornicles   comparison of length of cauda and cornicles
Aphid found in alfalfa; legs, antennae, cornicles, and cauda are long   Aphid found in cotton; legs, antennae, cornicles, and cauda are long

If the aphid's legs, antennae, cornicles, and cauda are short, the aphid can't be identified using this key. Please contact your Cooperative Extension farm advisor for assistance.

Where are the cornicles and cauda?

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