1. Soybean root rot: The disease can occur in the whole growth period of soybean and cause damage, and the yield reduction range is 25--75% or more. The protein content of the damaged seeds was significantly reduced. The main symptom was dark brown spots on the base of the stem, and spread to the lower side branches to different extents, causing the diseased stem to brown, the base of the petiole to collapse, and the leaves drooping, but not falling off. The main application of chemical control is 58% toxic mycelium manganese zinc or 72% kelu wettable powder. The dosage is 0.3-0.4% seed dressing.
2. Soybean Sclerotinia: Soybean sclerotinia is mainly immersed in stems. It begins to develop in late July. There are brown lesions on the stems at the beginning of the infiltration. Later, there are white cotton-like mycelium and white particles on the lesions, which turn black. Granules (sclerotia). Longitudinal stalks of the diseased plant can be seen in the sclerotium of the black cylindrical column-like mouse, and the diseased plant is grayish white after death. The medicament is sprayed with a 50% speed Keling wettable powder 1000 times solution or 40% nuclear bacteria net 1000 times solution or 50% methyl thiophanate 500 times solution.
3. Soybean gray spot disease: also known as spot disease, generally began to occur on the leaves in mid-June, and entered the peak period in mid-July. The pods began to develop from the tender pod stage, and the bulging period was the peak period of the disease. From July to August, the disease occurred in the hot and rainy years. It is mainly harmful to the leaves. When all the leaves are severely affected, almost all the leaves are covered with disease spots, causing the leaves to fall off prematurely, and the yield is reduced by 20--30%. At the same time, the 100-grain weight decreases and the quality is reduced. Chemical control: In addition to seed dressing with 70% dikesone wettable powder or 50% thiram wettable powder at 0.3% seed dressing, in the soybean flower pod period, 40% carbendazim suspension per hectare 1.5 kg, sprayed with 450 kg of water.
2. Soybean Sclerotinia: Soybean sclerotinia is mainly immersed in stems. It begins to develop in late July. There are brown lesions on the stems at the beginning of the infiltration. Later, there are white cotton-like mycelium and white particles on the lesions, which turn black. Granules (sclerotia). Longitudinal stalks of the diseased plant can be seen in the sclerotium of the black cylindrical column-like mouse, and the diseased plant is grayish white after death. The medicament is sprayed with a 50% speed Keling wettable powder 1000 times solution or 40% nuclear bacteria net 1000 times solution or 50% methyl thiophanate 500 times solution.
3. Soybean gray spot disease: also known as spot disease, generally began to occur on the leaves in mid-June, and entered the peak period in mid-July. The pods began to develop from the tender pod stage, and the bulging period was the peak period of the disease. From July to August, the disease occurred in the hot and rainy years. It is mainly harmful to the leaves. When all the leaves are severely affected, almost all the leaves are covered with disease spots, causing the leaves to fall off prematurely, and the yield is reduced by 20--30%. At the same time, the 100-grain weight decreases and the quality is reduced. Chemical control: In addition to seed dressing with 70% dikesone wettable powder or 50% thiram wettable powder at 0.3% seed dressing, in the soybean flower pod period, 40% carbendazim suspension per hectare 1.5 kg, sprayed with 450 kg of water.
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