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Pests in Gardens and Landscapes

Measles—Fungi in the genera Fomes, Cephalosporium, and Stereum

Grapes that have been infected with measles display small chlorotic interveinal areas on leaves. Dark red margins may surround the dead interveinal areas for some varieties. Severely affected leaves may drop and canes may die back from the tips. On berries, small, round, dark spots, each bordered by a brown purple ring, may occur. Berries may crack and dry on the vine.

Solutions

It is assumed that measles is caused by wood-rotting fungi that gain entrance through large pruning wounds. There are no recommended treatments at this time.

Severely affected leaves
Severely affected leaves

Measles on berries
Measles on berries

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