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Identifying Caterpillars and Their Damage
Grape
Identifying Caterpillars and Their Damage—Bloom
Monitor for omnivorous leafroller, western grapeleaf skeletonizer, grape
leaffolder, and orange tortrix (in coastal areas) 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
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.
|
Identification tip: Omivorous leafroller and orange tortrix
both make silken nests on grape flowers.
|
Orange tortrix
The larva is straw-colored
with a brown head and prothoracic shield.
|
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. |
Identification tip: Grape leaffolder larvae curl leaves and tie them
together with silk.
|
| Western grapeleaf skeletonizer |
Damage from western grapeleaf skeletonizer |
Western grapeleaf skeletonizer
Identification tip: Feeding by larvae of western grapeleaf
skeletonizer leaves the surface of foliage pale and scraped.
|
Identification tip: Whitish spots on a grape leaf caused by feeding
of first-instar
larvae.
|
The fourth- and fifth-instars are yellow with two purple and several blackish
bands. |
Typical damage by first-generation western grapeleaf skeletonizer on lower shaded
leaves of grapevine. |
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