Powdery mildew — Tomato

Symptoms

Symptoms generally begin on the lower, older leaves and gradually progress upwards. yellow blotches or spots appear on the upper leaf surface, while white powdery fungal growth develops on the lower surface or upper surface (Oidium neolycopersici) depending on the pathogen. Older fungal colonies may become dirty white with age. Severely affected leaves turn yellow, then brown, and eventually become shrivelled and dry. Severe infection may cause extensive defoliation, reduce yield and expose fruits to sunburn damage. Fruits and roots do not develop any visible symptoms.