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Grape > Year-Round IPM Program > Rapid Shoot Growth > Identifying Caterpillars

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Grape

Identifying Caterpillars

On this page
  • Omnivorous leafroller
  • Western grapeleaf skeletonizer
  • Orange tortrix
  • Grape leaffolder

Look for omnivorous leafroller, western grapeleaf skeletonizer, grape leaffolder, light brown apple moth, and orange tortrix (in coastal areas) during rapid shoot growth. As the season progresses, look for natural enemies of caterpillars. Names link to more information on identification and management.

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Caterpillars

Omnivorous leafroller
Omnivorous leafroller
Identification tip:  Larvae have a black or brown head capsule and range from cream to brownish green with whitish tubercles on the top of the abdomen.

 Western grape leaf skeletonizer
Western grapeleaf skeletonizer
Identification tip: The third-instars are brownish and line up to feed. Fourth-instars are yellow with two purple and several blackish bands.

Orange tortrix larvae
Orange tortrix
Identification tip: Larvae are straw colored with a brown head and prothoracic shield.

Grape leaffolder
Grape leaffolder
Identification tip: Larvae are translucent-greenish. Small black spots, located above the second pair of legs, distinguish later larvae from omnivorous leafroller.

 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.		  

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