Prediction of occurrence of soybean aphids
According to the investigation results of various measuring and forecasting stations in the province, combined with the comprehensive analysis of crop growth and meteorological conditions, it is expected that soybean aphids will occur moderately in the province this year, with less Rain Water in some cities and counties with large aphids in the early stage. The peak period of occurrence and damage of soybean aphid is from mid-July to early August.
1. The occurrence time is earlier than usual. According to the monitoring of various measuring and forecasting stations and plant protection stations in the province, the aphid period was found on June 10, which was later than that of last year, but still earlier than about 10 days all the year round.
2. The meteorological conditions are disadvantageous to the occurrence of soybean aphids. Since July, there are more Rain Water, the temperature is slightly lower, and the number of aphids increases slowly. according to the forecast of the meteorological department, July and August in our province is the middle period of rainy period, the precipitation is more than that in the south and less in the north, and the air temperature is slightly higher than that in the normal year, which has a certain influence on the occurrence of soybean aphids.
According to comprehensive analysis, soybean aphids occurred early this year, but because the meteorological conditions are not very favorable, it is expected that the occurrence of soybean aphids in the whole province is medium, the occurrence and distribution is uneven, and some areas with suitable climatic conditions will achieve heavy occurrence. All localities should pay attention to field monitoring and timely organize and control the plots that reach the control target.
Prevention and control suggestion
When soybean aphids occur, 5% of soybean aphids curl leaves in the field, or the rate of aphids is more than 50%, and the number of aphids is more than 1500, 3000 aphids can be sprayed for control. The specific agents and dosage are: 10% of the heroes (once net, imidacloprid, aphid die) 10% 20 grams per mu; or 3% Mobilang EC 10 ml 20 ml; or 2.5% green kungfu 15 ml per mu; or 25% Fengkuai 20 ml per mu. Or 25% Kuaishaling 20 ml per mu, the above chemicals 30 kg per mu of water, uniform spray.
The above insecticides can be mixed with Tianfengsu or plant nutrient solution to increase the control effect.
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Control techniques of soybean aphids
Soybean aphids belong to the family Homoptera, which is the main pest in soybean producing areas of Huachuan County. The occurrence period of soybean aphids has been advanced in the past two years, and the damage has also been aggravated. Soybean aphids tend to tender. soybean aphids concentrate on the top leaves, tender leaves and tender stems of the plant with adults and nymphs, which can not only cover the stems and leaves, but also damage the tender pods. When the plant was seriously damaged, the leaves curled, the root system was stunted and yellowed, the plant was short, the branches and pods decreased, and the 1000-grain weight decreased. If the occurrence at the seedling stage is not controlled in time, the light will be reduced by 20% to 30%, and the weight will be reduced by 20% to 30%.
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Control measures of soybean aphid disease
Soybean aphid is one of the main pests of soybean. Adults and nymphs are used to suck juice on the top leaves, tender leaves and stems of soybean plants. In severe cases, it is covered with stems and leaves, which can also infringe upon tender pods, resulting in dwarfism of plants, reduction of fruiting branches and pods, decrease of 1000-grain weight, and death of the whole plant at seedling stage. If it is not controlled in time in the big year, the yield will be reduced by 20-30%. If it is heavy, the yield will be reduced by more than 50%. The main soybean producing areas in China are all distributed, while the harm is more serious in some areas of Northeast China, Henan, Shandong and other provinces. Big
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