Soybean Fusarium mycorrhizal rot
Symptoms: Fusarium mycorrhizal rot is one of the common root rot diseases of soybean. It mainly occurs in the seedling stage. The root and stem basal therapy of the diseased plant produced oval brown strip to irregular concave spot, which expanded into a large patch around the main root, and some damaged the lateral root. The fungus is mainly harmful to the cortex, resulting in slow emergence of diseased seedlings, chlorosis of cotyledons, less lateral roots and fibrous roots, black roots in the later stage, epidermis rot, yellowing and dwarfing of diseased plants, early shedding of leaves under treatment, diseased plants generally do not wither and die, but few pods and small grains.
Prevention and control measures should be taken to give priority to prevention. (1) selecting disease-resistant varieties. Such as Heihe No. 3, Hongfeng No. 3 and so on. (2) sowing early at the right time, mastering sowing depth, implementing subsowing tillage, reasonable rotation, selecting disease-free seeds, etc. (3) mixing seeds with 50% of 0.3% seed weight has a certain control effect. (4) Chemical control see Phytophthora root rot of soybean. (5) spraying plant power 2003 or more rare earth nutrients if necessary.
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Control techniques of soybean root rot in Heilongjiang Province
Root rot is common in soybean producing areas in Heilongjiang Province. the general diseased plant rate in the field is 30%-40%. The diseased plant rate in low-lying land and continuous cropping land is more than 70%, and the highest seedling death rate is more than 15%. The occurrence in the eastern region is more serious than that in the western region, and the occurrence is the most serious in the eastern soil moist area. In general years, the rate of diseased plants in the early growth stage (before flowering) of soybean is about 75%, the disease index is 35%-50%, and the disease index can reach more than 60% in rainy years. The incidence of soybean root rot mainly depends on the bacteria in the soil.
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Control of soybean root rot
1. Disease resistant varieties were selected. two。 Rotation with corn, millet, sweet potato and other non-host crops. 3. Increase the application of farm manure, potash fertilizer, phosphate fertilizer and so on when sowing. 4. When sowing, metalaxyl granules were applied to absorb soybean roots and prevent root infection. 5. Mix seeds with 35% metalaxyl powder with 0.3% seed weight before sowing. 6. Strengthen field management, timely deep ploughing and mid-ploughing soil weeding, timely removal of stagnant water after rain to prevent excessive humidity. 7. When diseased plants are found, the remains of diseased plants should be removed thoroughly, and planting holes in diseased plants and
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