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Common Grapevine Fungal Pests

In the table below, we list the common fungi which you are likely to address with a regular spray schedule each season. The buttons direct you to topic pages at Grapeseek, the Ohio State University Extension Service, and the Horticulture Research Institute of New Zealand.

Where we have had the misfortune of first hand experience, we offer a page of comments, suggestions, and, in some cases, a brief forecast of what the balance of your growing season is likely to yield after identification and initial treatment.

Every serious grape grower should have a copy of Compendium of Grape Diseases. You may order a copy from Amazon by clicking on the book jacket image at the bottom of this page.

Early season shriveling of clusters, mummified berries. Black Rot GS OSU NZ
Leaves, fruit and green canes show dusty, gray-white covering. Powdery Mildew GS OSU NZ
Dense, white, cottony growth on lower side of leaves. Leaves fall off. Fruit ceases to ripen. Downy Mildew GS OSU NZ
Flower clusters and small shoots dry up and die. Berry set is poor and portions of clusters wither. Ripening fruit is covered with mold, and in wet weather, berries begin to burst. Botrytis (Bunch Rot) GS OSU NZ
See description provided by links. Phomopsis (Dead Arm) GS OSU NZ
Apparent ripe grapes with bitter taste and scarred skins. Bitter Rot GS OSU NZ

To order a copy of the Compendium of Grape Diseases, a must for any serious grower's bookshelf, click on the book jacket image.

Compendium of Grape Diseases

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