Grapevine Trunk Disease

Grapevine trunks weaken and decline from internal fungal infection, often without obvious external signs until vines collapse. Multiple fungi cause different trunk diseases affecting vines. Prevent by using certified disease-free stock, making clean pruning cuts, and avoiding mechanical injury to trunk and cordons during management.

Prevention works better than treatment for grapevine trunk disease. Choose resistant varieties when they exist, site plants where air moves freely, and maintain good sanitation by removing debris and infected material. When chemical intervention is necessary, timing matters more than product: apply protectants before the infection window, not after symptoms appear.