1, the onset of symptoms began from the surface of the stem 10 cm away from the ground to produce mottled spots, the lesion was dark brown periphery, the lesion was light brown to pale yellow, when the humidity is high, the surface of the lesions have gray mold layer, when dry The epidermis of the diseased part ruptured and formed a fibrous shape. When wet, the surface of the lesion is covered with a gray mold layer. The leaves were attacked and developed inwards from the tips of the leaves. They appeared as "v" shaped spots and began to be immersed in water and light brown. When the humidity was high, the surface of the lesions had gray mold. The scorpion was damaged, and it was initially immersed in water, light brown, and pitted. When the humidity was high, a gray moldy layer appeared on the surface of the lesion.

2. Control methods

1 Agricultural measures Protect beans grown in protected areas. In the morning, the beans must be released and then dampened. Then, the greenhouses should be warmed in the morning, the air should be released in the afternoon, and the humidity should be reduced to 75% to prevent condensation on the foliage. Apply more fully cooked organic fertilizer, increase phosphorus and potassium fertilizers. The sick place can use the summer leisure time to deepen the irrigation, flood the field, remove the floater on the surface of the water, burn it out of the field, or bury it deeply. The water is submerged for some time. Watering during the cultivation process should be selected on a sunny morning pouring. Before pouring, spray protection can be applied. After the water is poured, the greenhouse is closed. The temperature is about 35°C, and then the air is released to remove moisture.

2 Pharmacy control In the early stage of protection, 10% fast-king spirit smoke or 15% procymidone can be used, 250 grams per 667 square meters, closed smoke, smoked once every 7 days, continuous smoking 3 ~ 4 times. It can also be used to prevent contact with dust, available 6.5% moldo spirit dust agent, or 5% gain dust agent, spray 1 kg every 667 square meters, spray in the morning or evening, spray once every 7 days, even spray 3 ~ 4 times. It can also be sprayed and sprayed. Spray 50% quick-inking WP 1000 to 1500 times, or 50% isoprenil wettable powder 1000 to 1200 times, or 50% chloramphenicol wettable powder 600 to 800 times. Liquid spray, 3% polyoxygen water solution 600 to 900 times liquid, sprayed every 7 days, even spray 3 to 4 times.

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