Agriculture: Walnut Pest Management Guidelines

Natural Enemies of Dormant Season Pests

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.

Text Updated: 12/07
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