At present, the growth of soybean is in the period of flowering and podging. A variety of soybean diseases in the middle and late stages occur in different degrees in the field, mainly including soybean borer, soybean pod, soybean stem disease, and soybean sclerotinia.
Soybean meal, soybean borer
In July, there were more precipitation in our province, soil hemiplegia, overwintering larvae to the surface transfer and weather conditions are inappropriate. It is estimated that the occurrence of soybean borer in the province is moderately moderate, and that in the western and eastern counties (cities) with a relatively large number of genera has a tendency to occur. This year, the occurrence period of soybean meal was higher than usual, and the amount of soybean meal was lower than the same period of the year. At present, the distribution of soybean meal is uneven in the field. Most of the land plots are in the stage of spotting. Generally, there are 100 to 700 maggots in the plot, and 4,000 to 4,000 maggots in the heavy plots. For 30 to 50%, individual plots reach 70 to 80%.
Prevention and control recommendations: Soybean meal control: Field spotting Aphid 5% to 10% of the plants when the leaf rolling or a defective plant rate of more than 50% control. Use high-efficiency, low-toxic, and environmentally-friendly insecticides: 3% acetamiprid EC 15-20 ml per mu; 48% chlorpyrifos EC 100 ml per mu. In areas where red spiders also occur, the above agents can also be mixed with 1.8% abamectin in an amount of 20 ml per mu to prevent red spiders.
Soybean borer control: When the adults of the soybean borer appear in the field, and the amount of moths in each group is large, there is a phenomenon of double growth, indicating that the adult has entered the prosperous period, and the adult is controlled within 1 to 2 days. 7-10 days after the adult period is suitable for larval control. Take field spray control, 25% cyanine EC can be used per acre 20 to 30 ml, or 2.5% lambda-cyhalothrin water emulsion 20 ml, or 2.5% deltamethrin EC 20 to 30 ml per mu 30 kg water Spray and spray should pay attention to the effect of rain on the efficacy.
Soybean stem disease, sclerotia middle weight
Soybean stem disease mainly occurs in the main soybean producing area in the northwestern province of our province. It will cause moderate to heavy burden; Soybean sclerotinia disease will be more important than normal. Many years of continuous cropping in the main soybean producing areas in our province resulted in excessive accumulation of field diseases and debris, which provided ample pathogenic bacteria source for the occurrence of soybean diseases; in July, the province had more rainfall and more precipitation in the province in mid-July. Precipitation is still high in the second half of the year and it is beneficial to diseases.
Prevention Recommendations: Soybean stem disease prevention and control: 1, agricultural control. The drainage area should be promptly drained, the application of phosphorus and potassium fertilizers should be appropriately increased, field management should be strengthened, strong seedlings should be cultivated, and the resistance to disease should be enhanced. Prevent pests in a timely manner, reduce plant wounds, and reduce the spread of pathogens. The diseased leaves and diseased plants were removed in time and brought out of the field and burned. 2, chemical control. Should be mastered at the early stage of onset of spraying, 25% ramram EC 250 ml + 43% Halic 50 ml/ha; or 12% phenyl bromide aqueous solution 2000 times; or 36% Thiophanate Suspension 600x ; Or 50% carbendazim WP 600 ~ 700 times liquid.
Soybean sclerotinia prevention and control: 1, agricultural control. Farmers were organized to conduct field investigations, and serious inspections were carried out on key plots. The diseased plants were found to be removed in a timely manner and taken out of the field for disposal. Timely cultivating soil in the field will promote rooting, and bury the sclerotia in the deep soil to reduce the disease. 2, chemical control. When the disease area is large, it is necessary to spray or protect the central diseased plant to prevent the disease from spreading. A motorized mist sprayer should be used. The nozzles should be operated downwards to ensure that the middle and lower plant leaves are armed with medicines or sprayed with self-propelled high-rod sprayers. According to the investigation of the control effect of various regions, the current medicines with better control effect on sclerotinia have 50% procymidone, 40% sclerotin, 25% prochloraz, 50% iprodione, 1.5 kg/ha, on water Spray, apply once every 7 days.
When spraying, strictly follow the "Safety Drug Use Specifications" operation.
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