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Identifying Virus-Infected Western Grapeleaf Skeletonizer

Granulosis virus may reduce western grapeleaf skeletonizer populations to below economic levels. Look at the photos of infected and non-infected western grape leaf skeletonizer below to help you identify the presence or absence of the virus in your vineyard.

Click on photos to enlarge

Healthy western grapeleaf skeletonizer

Virus-infected western grapeleaf skeletonizer

Egg mass laid by western grapeleaf skeletonizer
Identification tip: The egg mass laid by a healthy western grapeleaf skeletonizer female is arranged in a neat cluster on the surface of a leaf .

Eggs laid by virus infected western grapeleaf skeletonizer
Identification tip: Eggs laid by a virus infected western grapeleaf skeletonizer female are scattered on the surface of a leaf.

Healthy first-instar larvae
Identification tip: Healthy first-instar larvae of the western grapeleaf skeletonizer feed in a neat line.

Virus infected larvae
Identification tip: Virus-infected larvae of western grapeleaf skeletonizer feeding in a disoriented pattern.

Noninfected fourth instar larvae
Identification tip: Noninfected, fourth-instar larvae are homogeneous in size and shape.

Virus infected mature larvae
Identification tip: Virus-infected mature larvae shrivel as they die.

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