Identification and Prevention of Soybean Root Rot Disease
Soybean root rot occurs in soybean growing areas and aggravates in continuous cropping, mountainous areas, and low-lying conditions. The onset of disease caused by lack of seedlings in the field, yellowing, reduced production, generally reduce the production of 10 to 30 kg. Due to the increase in the price of soybeans, it will inevitably cause an increase in the area under soybean cultivation and increase the area for replanting. The disease will inevitably show an upward trend. First, the symptoms can be from the seedlings to adult plants can be the disease, the seedling stage occurs in the stem base and roots, lesions at the beginning of brown spots, expanded after the prism, strip or irregular shape, slightly concave large spots, sick When the lesion was "rust color", reddish-brown or dark brown, cortical decay was ulcerous, severe roots and fibrous roots of fibrous root decay, resulting in "bald root." Soybean disease will not infect fibrous roots, which is the main difference. The diseased plant grew poorly on the ground, and the diseased seedlings were short and thin, and the leaves had a small yellowish color and died when they were severely dry. In the adult plant stage, the roots of the diseased plants produced brown spots, irregular in shape, and of varying sizes. When the disease was severe, the roots showed cracks in the lignocellulosic tissue, and the diseased part had more lean, less pods, and less pods. Soybean root rot occurs in the field often as "potholes", round or oval. It is different from the “broken bar†caused by the development of pests. Second, the prevention and control methods 1, rotation and grass crops should be implemented more than 2 years of rotation. 2. Select light soybean varieties. 3. Appropriate late sowing of agricultural measures, control of sowing depth, general sowing depth should not exceed 5cm. Add PB or organic fertilizer. Rationally cultivating the soil in the cultivating field, implementing deep looseness, eliminating water in the field in time, improving soil ventilation conditions, and preventing underground pests. 4. Seed treatment with 50% Dufu Mixture wettable powder, according to the seed amount of 0.4% seed dressing; with Bactobacillus grams (2% Ning Nanmycin water) seed dressing by 1%; 50% Fome Double wettable powder or 50% carbendazim wettable powder is seeded at 0.5% of the seed amount; “Soybean microcomposite fertilizer†prepared by the Provincial Academy of Agricultural Sciences Plant Protection is used for seed dressing; 35% containing fungicides Dokford soybean seed coating seed dressing; spraying plant compound nutrient solution at the seedling stage; with the fire dragon enemy in the soybean seedling stage foliar spray can root strong seedlings, interval 7 to 10 days and even spray 2 or 3 times.