University of Maryland Extension

grapevine red blotch

Red Leaves in the Vineyard—Diagnosis and Management

Timely Viticulture Timeline: Pre-Bloom to Post Harvest
It is not uncommon to walk a vineyard row and find some vines with red leaves somewhere in the canopy. Red leaves can appear at any time in the growing season and are caused by many biotic (viruses, bacteria and fungus) and abiotic (nutrient deficiencies, cold injury and damage to root systems, etc...
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