How to Manage Pests

Pests in Gardens and Landscapes

Phomopsis cane and leaf spot—Phomopsis viticola

Leaf blades and veins infected with Phomopsis have tiny dark to brown spots with yellowish margins; basal leaves may become distorted. On shoots, small spots with black centers are found. Berries may have light brown to dark spots on them and eventually shrivel and become mummified. Infected canes appear bleached during the dormant season. Severely affected canes or spurs exhibit an irregular dark brown to black discoloration intermixed with whitish bleached areas.

Life cycle

Solutions

Phomopsis cane and leaf spot is most serious following a wet spring. However, it is not a serious concern in home vineyards. Prune out bleached canes during the dormant season.

Leaf spots with yellowish margins
Leaf spots with yellowish margins
Infected cane
Infected cane
Scabby shoots
Scabby shoots

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