Bean powdery mildew Symptoms: mainly damage the leaves, but also damage stem vines and pods. The leaves were infected, and yellow-brown spots appeared on the back of the leaves. After the enlargement, they appeared purple-brown spots and covered with a thin layer of white powder. The fungus is a fungus that is a subphylum subphylum.
Symptoms of bean rust: mainly harm the leaves, and in severe cases also damage the petiole and pods. At the beginning of the disease, the back of the leaf produces a small yellowish spot, which turns rust brown. The uplift is small pustules. It expands into the summer spores. The epidermis ruptures and emits a red-brown powder, namely the summer spores.
Control methods: In the initial stage of onset, spray 70% ketorol WP 500 times, or 40% CRC wettable powder 600 times, 50% sulfur suspension 300 times, powder must be 150 times clear. 5-7 days, spray 2-3 times.
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