Pay attention to pest control during the late period of soybean growth
According to the field monitoring surveys at plant protection stations and comprehensive analysis of cultivation and meteorological conditions, it is estimated that the major diseases and insect pests of soybean in the middle and late period of our province are generally moderately mild.
In view of the current stage of prevention and control of late-stage diseases and insect pests in soybeans, various localities must further strengthen field investigations and monitoring, timely release dynamic information, extensive publicity and guidance, actively organize and launch peasant households, and be optimistic about their own plots; Take a comprehensive combination of agronomic and chemical measures to effectively control pests and diseases.
Prevention and control recommendations: 1, soybean borer. When adult moths emerged as moths in the field, and the amount of moths in each group was large, they showed a phenomenon of multiplied growth, indicating that adult moths had entered the peak period and that adults should be controlled within 1 to 2 days. Soybean ridged plots can be filled with sorghum or corn stalks to attract dichlorvos into the field and fumigation. It is important to note that dichlorvos are harmful to sorghum and cannot be used in soybeans within 20 meters of sorghum. Land that is not well sealed can be used. Medicinal agents such as lambda-cyhalothrin or deltamethrin are sprayed to prevent and control other insect pests.
2. Soybean aphids. When there are pods in the field exceeding 50%, 100 pods amounting to 1500~3000 or more, the leaf rolling rate of the plants exceeds 5%, and the number of natural enemies should be reduced. Plant source pesticide matrine, or acetamiprid, imidacloprid and other agents can be used for spray control. In the land where red spiders occur at the same time, the above agents can be mixed with avermectin and prevent spider mites.
3, soybean fungal disease and other diseases. Farmers were organized to conduct field investigations, and serious inspections were conducted on key plots. The central diseased plants were found to be removed in time and brought out of the field to be buried deeply. When the disease area is relatively large, it is necessary to spray or protect the central diseased plants to prevent the disease from spreading. A motorized mist sprayer should be used to apply the spray, the spout should be operated downwards, and the middle and lower plant leaves should be drugged, or the self-propelled high-rod sprayer should be used to spray the medicine. Pyrolidol, sclerotin, and prochloraz may be used as control agents, and water, water emulsions, and water dispersible granules may be used preferentially to reduce environmental impact. For the prevention and treatment of late-stage foliar diseases such as gray leaf spot, downy mildew, etc., broad-spectrum agents such as mycetobacilli and imidamide can be used.
When spraying pesticides should be strictly in accordance with the "pesticide safety operating procedures," spraying, pay attention to drug safety.
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