Soybean virus is the most serious hazard of soybean disease. It should be treated with pesticides in a timely manner. According to the geographical position and weather changes, the time and changes are different. It is necessary to understand the disease symptoms and the disease law in time. The necessary means to ensure a stable and high yield of soybeans.
1. Symptoms of the disease: Most soybean varieties do not show obvious symptoms at the seedling stage, and only a few rust-like spots appear on the leaves. The typical symptoms appear after flowering. The top of the stem of the diseased plant is bent downward into a hook shape. The top leaves, buds and stems become brown and dry, and the pith is brown. The necrotic part spreads down. Brown necrotic streaks are produced on the petiole, and irregular brownish necrotic spots are also present on the pods, and the leaves often do not show symptoms. Plants with early onset are obviously dwarfed, with few pods or pods, and some are not branched. In addition, the diseased plants may also appear dwarf, flower buds and compound leaves, large expansion, and the leaves are abnormally dark green. The harvesting season is often dark and green, and the leaves are normal and do not produce brown. Plaque.
2. Incidence pattern: The occurrence and epidemic of top blight vary greatly between years and regions, but the epidemic law has not yet been fully understood. The survey showed that the perennial pasture and the soybeans near the wasteland were early and severe, and the soybean fields adjacent to non-host crops such as corn were late and light. Soybeans can be ill at any stage of growth and have a high susceptibility rate before flowering. Most soybean virus diseases can be transmitted by seeds, and it is difficult to detoxify the seeds after poisoning. It is ineffective to treat the seeds with chemicals or to use the growth point culture method.
3. Control method:
1 Strengthen quarantine to prevent the spread of disease.
2 Breeding resistant varieties and using non-toxic seeds.
3 control of aphids can reduce the risk of viral diseases, spraying 2.5% of the enemy to kill 5,000 times of liquid in the seedling stage; also can use 3% carbofuran powder 2 kg per mu, mixed with fine soil 15 kg, sown in the bean mulch Application, treatment of mites and cyst nematodes.
4 Intercropping of soybeans with high-stalk crops, early sowing in the appropriate period, and removal of weeds in the field can alleviate the disease .

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