Second, beans powdery mildew symptoms: major damage leaves, but also against the vine and pods. Infected leaves, the early dorsal appear brown spots, enlarged, purple-brown spots, overlying a layer of thin white powder. Pathogenic ascomycete subphylum of fungi. 3. Comprehensive prevention and control methods: In the initial stage of onset, spray 70% ketamine WP 500 times, or 40% CRC copper wettable powder 600 times, 50% sulfur suspension 300 times, powder 150 times. 5-7 days, continuous spray 2-3 times.
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Green Bean Stalk Disease Prevention and Control
First, the occurrence of symptoms of bean rust: the main damage to the leaves, in severe cases also harm the petiole and tinea. In the early stage of disease, small yellowish spots appeared on the back of the leaves, which turned brown and rusted. The uplift was small pustules and then expanded into summer spores. After the epidermis ruptured, a red-brown powder was emitted. That summer spores.