S. sclerotiorum: S. sclerotiorum is mainly infected with stems. It begins to grow in late July. There are brown lesions on the stalks at the beginning of the infection. Afterwards, there are white cotton flocculent mycelium and white particles on the lesions, and later changed into black particles ( Sclerotia). The stalks of the diseased plant can be seen in the sclerotia of a black cylindrical mouse. The diseased plant is grayish after death. The drug control was sprayed with 50% Sikrodine WP 1000 times solution or 40% NF bacteria 1000 times solution or 50% thiophanate 500X solution. Soybean gray spot disease: also known as spot disease, usually begins on the upper and middle leaves in June, and enters the onset of disease in mid-July. Soybean meal began to develop from the tender period, and the bulging period was the peak of onset. In July and August, the onset was heavy in the case of high temperature and heavy rain. It mainly damages the leaves. When the disease is severe, almost all the leaves are covered with lesions, causing the leaves to fall off prematurely, and the losses are reduced by 20% to 30% and the quality is reduced. Chemical control: except that 70% of dexamethasone WP or 50% of thiram is used to sow seeds at 0.3% of the seed amount during sowing, and 40% of carbendazim is suspended per hectare during soybean scape 1.5 kg of water, spray 450 kg of water.
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Soybean disease control measures
Soybean root rot disease: The disease can occur in the whole growth period of soybean and cause damage, the reduction rate of 25% to 75% or more. The protein content of the damaged seed was significantly reduced. The main symptom was dark brown spots on the base of the stem, and diffused to the lower lateral branches in various degrees upwards, causing the medullary stems to become brown, the petiole bases contracted, and the leaves drooped, but did not fall off. The main application of pesticide control is 58% of thiram Mn-Zn or 72% Kelu wettable powder, and the dosage is 0.3%-0.4% seed dressing.