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How to Manage Pests

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

Typical aphid features

This drawing of a "typical" aphid shows a number of morphological features important in identification.

  1. Look at an aphid through a 10x hand lens to see the important characters that distinguish the aphids included in this key.
  2. On each page of the key, click on the box that matches the character of the aphid you’re trying to identify.

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