Medium term forecast and control technology of occurrence trend of wheat scab


I. The occurrence trend is more frequent in the nearest area, while the nearest area, Lingbi county, and south of Sixian county, the nearest spike and flowering time of wheat is expected to be around April 20th.(1) The meteorological conditions are favorable.The precipitation in the middle and late march is more than that in the whole year. At present, the whole city has suitable moisture content, while the Dangshan mountain is more.According to the forecast of the municipal meteorological department, the average temperature in early and middle April is higher than usual, and the precipitation is more, which is easy to cause the high humidity in the field, which is conducive to the occurrence of scab.(2) Sufficient bacteria source in the field.According to the recent survey, the average branch carrying rate of corn straw is 0-1.2%, lower than the same period in recent years, but in the middle and later period of March in our city precipitation is more, the average temperature is close to the perennial, with the appropriate temperature and humidity in the late period, the field source will be further increased to meet the bacterial source base required for the occurrence of fusarium graminearum.(3) Host disease resistance is not strong.The proportion of wheat varieties susceptible to scab is large, which is conducive to the incidence of scab.(4) The cultivation method is favorable.Part of the wheat field sowing quantity is large, the wheat group is large, the field shade, ventilation and light permeability is poor, and this year’s wheat seedling situation is complex, the growth is not balanced, the growth period difference is large, will lead to fusarium head blight easy infection period elongated, conducive to the occurrence of fusarium head blight.(1) Prevention and control tasks: ensure that the prevention and treatment rate reaches 100%, and the disease particle rate does not exceed 3%.(2) Prevention and control strategy: prevention first, active attack, unified prevention and control, highlighting green prevention and control technology, scientific chemical control.(3) Prevention and control methods The whole-process green prevention and control, quality control, harm control and increase production technology will be fully implemented.1. Agricultural prevention and control rationally manage fertilizer and water, clean ditches and drain water in time, reduce field humidity and reduce the occurrence of diseases.2. Chemical control first is to choose a good time.Grasp the wheat from full head to flowering stage to carry out the first control (see flower medicine), use enough medicine according to the upper limit recommended by the control drug manual, carry out the second control depending on the weather change.Young flowering in rainy weather, choose the rain stop gap or rob in the rain before the application of medicine, medicine within 6 hours of the rain should be timely repair.The second is to choose a good drug.Implementation of wheat fusarium head blight prevention and control, and also to treat aphids, rust, powdery mildew and other overall control technology.Fusarium head blight control agents must have strong permeability, rain erosion resistance, good efficacy and other characteristics.The recommended selection of agents should be considered comprehensively in terms of good disease control effect and strong toxicity control effect on fusarium graminaria, and prothiobacillazole, cyanoene-tebutazol, fluzomycoid and propiconazole, which have concurrent treatment effect on rust and powdery mildew (for specific ingredients, please refer to “Major Disease and Insect Pest Control Plan of Wheat and rape in Anhui Province 2021-2022”).Pay attention to alternate use of agents of different mechanisms of action to avoid or delay the emergence of drug resistance.Carbendazim resistant high area, stop using the carbendazim and its compound with potions, when using three azole fungicide control wheat gibberellic disease, according to the requirements of the product’s pesticide registration, to ensure enough active ingredient usage (effective component usage per acre e listed is not less than 8 g), to delay resistance development, reduce toxin pollution.Demonstration application of nano pesticide, “exciting health” and other agents and reduce the amount of synergistic additives, effectively improve the utilization rate of pesticides.Three is to choose a good medicine.Promote plant protection unmanned aircraft, self-propelled rod sprayer and other modern efficient plant protection machinery to control wheat scab.The operation standard of plant protection unmanned aerial vehicle was standardized, and the technical parameters of plant protection unmanned aerial vehicle for wheat fusarium head blight control were implemented (water consumption of 0.8-1.5L per mu, flight altitude of 1.8m-2.2m above wheat canopy, flight speed less than 6m/s).Autonomous flight mode should be used for pesticide application of plant protection UAV, and flight prevention additives should be added for edge sweeping prevention.Heat mist control, should be used with stabilizer.Fourth, choose a good platform.The provincial plant protection unmanned aerial vehicle (UAV) management platform for crop major diseases and insect pests prevention and control was fully applied, and the third party supervision was carried out for the prevention and control of fusarium head blight by UAV to improve the quality of prevention and control operations.Give prominence to key measures and areas to strengthen the prevention and control of scab.Declaration: The copyright of this article belongs to the original author, if there is a source error or infringement of your legitimate rights and interests, you can contact us through the mailbox, we will promptly deal with.Email address: jpbl@jp.jiupainews.com

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