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General life cycle of aphids. Asexual reproduction occurs during most of the year (summer cycle). Some aphid species produce a generation of sexual individuals that produce overwintering eggs as shown in the winter cycle.

Illustration adapted from Pests of the Garden and Small Farm, 1st edition, UC ANR Publication 3332 and R.H. Davidson and W.F. Lyon, 1979, Insect Pests of Farm, Garden, and Orchard, John Wiley and Sons, New York.

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