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Figure

Schematic diagram of pear psylla populations showing importance of reducing overwintering populations before egg laying occurs in late January to early February. Broken line represents a good IPM program where dormant treatments were used to bring populations down below 1 adult per 100 beats before egg laying. Populations can be maintained below economic levels with normal summer sprays and naturally occurring biological control. Solid line represents a program where at least 5 adults per 100 beats remained at egg laying time. Populations can not be reduced even with additional sprays. Substantial economic loss occurs (shaded area).

Illustration from Integrated Pest Management for Apples and Pears. UC ANR Publication 3340.

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