How to Manage Pests

Pests in Gardens and Landscapes

Pest identification and confirmation—Orange tortrix

Orange tortrix prefers the top half of trees and twice as much damage occurs there than on the bottom half of trees. On grapes, look in clusters for webbing, but do not confuse spider webs with orange tortrix webbing. Confirm diagnosis by checking for other evidence of orange tortrix such as caterpillars or feeding damage.

Orange tortrix may sometimes be confused with Amorbia. On Amorbia larvae a black stripe on the side of the head and the segment behind it distinguishes them from orange tortrix larvae.

Webbing and caterpillars in grape clusters
Webbing and caterpillars in grape clusters
Amorbia
Amorbia
Orange tortrix
Orange tortrix

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