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Identifying Scale

On this page
  • Frosted scale
  • Walnut scale
  • European fruit lecanium
  • San Jose scale

Names link to more information on identification and management.

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Frosted scale
Frosted scale
Identification tip: Frosted scales overwinter as brownish, flat nymphs.

Walnut scale
Walnut scale
Identification tip: After the first molt, males begin to develop an elongated covering, often clustered in daisy-shaped groups beneath the margin of the female’s round cover.

European fruit lecanium
European fruit lecanium
Identification tip: Look for legless, immobile, yellow insects on twigs. Older nymphs may have brown markings and a distinct center ridge.

San Jose scale nymphs
San Jose scale (nymphs)
Identification tip: The four round, dark scales in the center are the black cap stage, the most common overwintering form. The earlier white cap stage is to left.

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