Vegetable bean anthracnose is a common disease of kidney bean, which is distributed all over the country and affects the yield and quality of kidney bean. It can continue to harm during transportation and storage. The onset of disease began at the seedling stage, and reddish-brown near-round lesions appeared after the damage to the cotyledon. In the adult stage, the leaves begin to appear reddish-brown at the beginning of the lobe, and then become dark brown and expand into polygonal reticular pattern. Leaf petiole and stem disease, lesions were rust-colored, long strips, often depressed and cracked, diseased parts above dead. The onset of soybean meal produces brown dots, which gradually enlarge into oblong lesions. The center is dark brown in color and the edges are pink. Several lesions can be merged into large lesions; lesions often produce pink viscous substances when wet. The lesions on infected seeds are dark brown or reddish-brown and yellow-brown, irregular in shape, undefined in size, and the seeds are easily rotted.
Prevention.
1, seed disinfection. Before sowing, soak it in warm water of 45°C for 10 minutes, wash and dry it and sow. Or seed dressing with 0.4% seed weight of 50% carbendazim WP.
2, agricultural control. A 2-3 year rotation with cruciferous, Liliaceae, Solanaceae, and Umbelliferae vegetables, or 2 years of rotation with non-legume food crops. Deeply pour the soil, apply sufficient organic fertilizer, and apply phosphate fertilizer and potash fertilizer. Ditch drain, sorghum cultivation, prevent flood irrigation. Protected cultivation should enhance ventilation and reduce humidity. After the onset of disease, disease leaves must be removed promptly.
3, chemical control. When cultivated in protective land, the old frame material should be disinfected with 800 times of 50% Daisen ammonium hydroxide solution. At the flowering stage or at the early stage of the disease, biological pesticides were sprayed with 2% agricultural anti-120 water agent 200 times liquid, every 5 days for a total of 3-4 sprays. You can also use 75% chlorothalonil wettable powder 600 times, or 70% thiophanate-methyl WP 500 times, or 80% FORD Zn wettable powder 800 times, once every 7-10 days. , continuous 2-3 times.
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