Powdery Mildew of Grapes
Erysiphe necator
Grapefungal
One of the most important grape diseases, coating leaves, shoots, and berries in powdery fungal growth.
Symptoms
White-to-gray powdery fungal growth on leaves, shoots, and berries; affected berries can crack and fail to develop properly.
Favorable conditions
- •Warm, dry days with high humidity at night
- •Dense canopy limiting sun and airflow
Management
- 1Apply a sulfur or systemic fungicide program from bud break through veraison
- 2Manage the canopy for sun exposure and airflow
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