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Walnut > Year-Round IPM Program > Dormant/Delayed Dormant > Identifying Natural Enemies

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Walnut

Identifying Natural Enemies of Scales—Dormant/Delayed-Dormant Season

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

Use the photos below to identify parasitization of scale. Names link to more information on identification and management.

Click on photos to enlarge

Parasitized frosted scale
 Frosted scale (parasitized)
Identification tip: Parasitized frosted scales turn black.

Parasitized walnut scale
Walnut scale (parasitized)
Identification tip: Look for exit holes in walnut scale covers.

Parasitized San Jose scale
San Jose scale (parasitized)
Identification tip: Look for exit hole in the covering of the scale.

Parasitized European fruit leacanium
European fruit lecanium scale (parasitized)
Identification tip: Parasitized European fruit lecanium scales, such as the center one above, turn black.

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