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Grape (Wine and Raisin)

Identifying Caterpillars and Their Damage—Bloom

On this page
  • Omnivorous leafroller and damage
  • Orange tortrix and damge
  • Grape leaffolder and damage
  • Light brown apple moth
  • Western grapeleaf skeletonizer and damage

Monitor for omnivorous leafroller, western grapeleaf skeletonizer, grape leaffolder, orange tortrix (in coastal areas) and light brown apple moth from bloom through veraison. Continue monitoring for western grapeleaf skeletonizer and grape leaffolder until harvest.

Use the photos below to identify caterpillars and their damage. Also look for natural enemies of caterpillars. Names link to more information on identification and management.

Click on photos to enlarge
Caterpillar Damage

Omnivorous leafroller larvae
Omnivorous leafroller
Identification tip: Larvae have a black or brown head capsule. Mature larvae are cream to brownish green with whitish slightly convex tubercles on the top of the abdomen.

Silken nests made by larvae of the omnivorous leafroller, Platynota stultana, and their feeding damage on developing grape flowers.
Identification tip: Omivorous leafroller and orange tortrix both make silken nests on grape flowers.

Orange Tortrix Larvae
Orange tortrix
The larva is straw-colored with a brown head and prothoracic shield.

A grape leaf curled and tied together with silk by the larva of a grape leaffolder, Desmia funeralis.
Grape leaffolder
Identification tip: Mature larvae are translucent-greenish with small black spots located above the second pair of legs, distinguishes later larvae from omnivorous leafroller.

Grape leaffolder larvae
Identification tip: Grape leaffolder larvae curl leaves and tie them together with silk.

Light brown apple moth Damage
Light brown apple moth larva
Light brown apple moth
Identification tip: The mature larva is pale-to-medium green with a light yellow-tan head. The first segment behind the head is greenish brown with no dark markings. However, larvae cannot be reliably identified using morphological characters. Take suspect larvae (preferably alive) to the County Agricultural Commissioner’s Office for proper identification.
No photo available.
Western grapeleaf skeletonizer Damage

Pale, scraped surface of a grape leaf fed upon by larvae of western grapeleaf skeletonizer, Harrisina brillians.
Western grapeleaf skeletonizer
Identification tip: Feeding by larvae of western grapeleaf skeletonizer leaves the surface of foliage pale and scraped.

 

Pale, scraped surface of a grape leaf fed upon by larvae of western grapeleaf skeletonizer, Harrisina brillians.
Identification tip: Whitish spots on a grape leaf caused by feeding of first-instar larvae.

Wester grapeleaf skeletonizer fourth and fifth instars
The fourth- and fifth-instars are yellow with two purple and several blackish bands.
Typical damage by first-geneation grapeleaf skeletonizer
Typical damage by first-generation western grapeleaf skeletonizer on lower shaded leaves of grapevine.
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