symptoms
Symptoms
- circleWater-soaked patches turning dark brown
- circleWhite mould on leaf undersides
- circleRapid collapse in wet weather
help
Causes
Caused by Phytophthora infestans. Spreads rapidly in cool, wet conditions.
healing
Treatment
Apply copper or phosphonate fungicide immediately. Remove all affected material.
shield
Prevention
Resistant varieties. Avoid overhead irrigation. Destroy potato cull piles.