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How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Scales

Scales overwinter as yellow to brown nymphs on bark. The immature male in the spring looks like a tiny, elongate, whitish cocoon. Females mature during spring and early summer and crawlers begin emerging in late spring; some settle and feed on the underside of leaves before returning to bark in the fall. The insect has one generation a year.

Scale crawlers on double-sided sticky tape
Scale crawlers on double-sided sticky tape

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