Symptoms and prevention methods of bean wilt disease
I. Symptoms Blight of bean bean wilt is a soil-borne disease. Symptoms are that the lower leaves of the diseased plants first yellow, and then gradually develop upwards. The veins on both sides turn yellow to yellow-brown on the two sides of the veins, and the veins are brown. In severe cases, the whole leaf is dry and coke is shedding. The roots of the diseased plants are stunted, and the cortex of the roots is rotten. There are few or no new roots and it is easy to pull up. Scarring of the diseased plants was significantly reduced. After entering the flowering stage, the diseased plants first showed wilting-like conditions and returned to normal in the morning and evening. In the later period, the diseased plants were wilting throughout the day and even died.
Second, prevention and control measures
(1) Rotation. Implementation of rotation for more than three years, the best conditions for crops with paddy crop rotation.
(2) Add lime to improve the soil. In the acid soil, 100 kg of raw lime can reduce the incidence of disease.
(3) Pesticide irrigation and control methods are available. In the early stage of disease, 50% carbendazim WP 1000 times solution or 10% double effect lingual agent 400 times solution or 75% thiophanate-methyl wettable powder 1000 times solution can be used, and 50-150 grams per plant, every 7 - Once in 10 days, 2-3 times in a row. 50% carbendazim WP can also be mixed with 200 kg of dry soil, applied to the sowing line, and applied 200 kg per mu. The key is: to prevent early, early management, or the effect is poor.
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