Plant Disease
Medium SeverityAffects: Wheat, Grapes, Chilli, Cucurbits, Mango · Cool, dry weather (15–25°C); unlike most fungal diseases, does NOT require free water for sporulation
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Erysiphe spp. / Uncinula necator (grapes) / Podosphaera xanthii (cucurbits) — obligate fungal parasites
White powdery patches on upper leaf surface, shoots, and flowers. Affected tissue turns yellow and dies. In mango, new flush and flowers affected — reduces fruit set.
Adequate plant spacing for air circulation. Avoid excess nitrogen fertilization. Use resistant varieties. Kaolin clay spray on mango creates a physical barrier.
Sulphur fungicides (wettable sulphur 0.3%) are very effective and economical. Tebuconazole or propiconazole for severe outbreaks. Potassium bicarbonate (4g/L) is organic option.
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