At present, there are no wheat varieties with high resistance to sheath blight, and timely medication is the main measure to prevent and treat the disease. The early stage of early spring disease is a critical period for the prevention and treatment of the disease, and the effect of remedy is unsatisfactory. The disease occurs more concealed. The initial lesion is in the lower part of the plant and should be observed. In the early spring, the first prevention and treatment is usually started when the diseased plant rate reaches 5%. After that (7-10 days), it is decided whether or not it needs to be re-administered.
For the control of wheat sheath blight, suitable drugs include Jinggangmycin, Thiofloxacin, Propiconazole, Hexiconazole, tebuconazole, diniconazole, epoxiconazole and other single agents and their mixed agents. Among them, Jinggangmycin has been used for many years, there is still no obvious resistance to drugs, but some farmers report poor control efficacy, may be a short duration of the drug (within 7 days), used to control wheat withered Diseases need to be administered multiple times; azoles and oxazoles and other azole bactericides have a longer duration of efficacy, and they last for more than 15 days, but they have different degrees of inhibition on wheat growth. Improper use of them can easily cause excessive inhibition of wheat growth. , should pay attention to the amount of drugs can not be too large, can not be frequent use of drugs; thienofuramide is benzoic acid bactericide, the duration of wheat sheath blight lasted for more than 30 days.
When there is dew on the morning wheat or in the evening, apply the medicine to the base of the wheat seedlings. With sufficient water, the water consumption per mu is not less than 50 kg. Severe sheath blight, the jointing stage of delivery should adopt the "high dose, large amount of water, splashing in advance or add water coarse spray" method to ensure that the liquid spilled into the stem base and other parts of the disease, and improve the control effect.
Chen Huaigu reminded that in addition to the timely use of drugs in early spring, the use of chemical seed dressing during the autumn sowing, the prevention and control of time forward, is an economic and effective measure to control wheat sheath blight, especially in early sowing wheat field occurs before the occurrence of sheath blight better The control effect is conducive to reducing the number of bacteria in the field, delaying and alleviating the incidence of spring diseases. Applicable drugs include Rikenxiu 6% fenazolol suspension seed coating agent, which can cure smut and other diseases, but it is necessary to control the dosage to prevent the emergence of seedlings.
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