Red Leaves in the Vineyard: Biotic and Abiotic Causes
Red leaves in the vineyard are caused by many biotic (viruses, bacteria and fungus) and abiotic (nutrient deficiencies, cold injury and damage to root systems, etc.) stresses. Anything that can cause blockage or stress in the vascular system where water and nutrients are transported, can result in the development of red leaves. Though the timing, pattern of appearance and spread could be different, the overlapping of the symptoms, especially the reddening of leaves, makes it very difficult to identify the cause based only on visual symptoms. The best strategy therefore is not to rely on guesswork, but getting the vines tested for accurate diagnosis as soon as possible.
Rutgers NJAES Cooperative Extension
Number of pages:
Red leaves, nutrient deficiency, virus, red blotch, Crown Gall, diagnosis