This fungal disease affects many types of plants, mostly in moist, humid conditions. Symptoms include yellow areas on leaves, followed by brown to purple mold growth on the undersides of leaves. It’s spread by wind, rain, and the use of infected seeds and can survive for up to three years in the soil. To control and prevent, plant disease-free seeds and plants, practice crop rotation, avoid handling wet plants, and remove and destroy infected plant material. Drip irrigation and spacing plants to allow for adequate air flow will help prevent infection. Also try using sprays of bicarbonate.
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