Powdery mildew on leaves. Fungal infection on leaves of the annual honesty (Lunaria annua) plant. Powdery mildew is a disease caused by many different species of fungi in the order Erysiphales. The infected plant first develops white powder-like spots, which increase in size and become thicker as many spores form. The disease then spreads throughout the length of the plant.

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達志影像

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