Plant Disease
High SeverityAffects: Tomato, Potato · Monsoon and post-monsoon (high humidity + mild temperature 15–25°C)
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Phytophthora infestans (water mould / oomycete)
Water-soaked lesions on leaves that turn dark brown with white fungal growth on the underside. Fruits develop brown, greasy patches. In humid conditions, the entire plant can collapse within days.
Use resistant varieties (Arka Rakshak for tomato). Avoid overhead irrigation. Ensure good air circulation by proper spacing. Remove and destroy infected plant material immediately.
Apply mancozeb (0.25%) or metalaxyl-mancozeb (0.25%) at first sign of disease. In severe outbreaks, use systemic fungicides like cymoxanil+mancozeb. Spray every 7–10 days during humid weather.
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