Even slight winds can carry small spray droplets toward a vineyard. Affected leaves are small, narrow, and misshapen, and have closely packed, thick veins that lack chlorophyll. The leaves sometimes are cupped, and the leaf margins often terminate in sharp points. Small, puckered, interveinal spots retain some green chlorophyll. Damaged flower clusters set very few or no berries.
Affected leaves are small, narrow, and misshapen.
Leaves sometimes are cupped, and margins often end in sharp points. Fall applications of glyphosate tend to be more effective than spring applications. Consider making applications in early spring before grapevines begin to grow or in the fall after their leaves have dropped. Always use extreme caution when making applications when desirable vegetation is present and temperatures start warming up. Monitor wind speed and direction closely.