Infection usually occurs at harvest as tubers come into contact with spores in the soil. Delay harvesting until tuber skins are mature. Avoid mechanical injury. Increase ventilation if rot occurs in storage area. Click to expand Leaves and stems develop brownish spots that spread rapidly under wet conditions.
Skin turns purple and looks bruised.
Flesh appears grainy and turns to orange, tan or brown. Failure to identify and treat early can result in significant crop loss. Follow a total disease management plan. Consult provincial Late Blight forecasting services, if available, for recommendations on risk of Late Blight occurrence and fungicide spray intervals. Unsightly silver to gold blemishes develop.