What is the method to prevent and control wheat powdery mildew?
The prevention and control of wheat powdery mildew is based on the cultivation of disease-resistant varieties and supplemented by chemical control.
(1) Selection of resistant varieties: There is a significant difference in resistance to powdery mildew between varieties, and attention should be paid to the selection of resistant varieties. Lumai 13, Lumai 14, Yuan 7107, Fengkang 2, Zhongmai 2, etc. have good resistance to powdery mildew, and can be selected according to local conditions.
(2) Improve cultivation management: Rational application of nitrogen, phosphorus and potassium fertilizers, appropriate application of phosphorus and potassium fertilizers to improve disease resistance of plants; try to eradicate self-produced wheat seedlings before autumn sowing, and reduce the incidence of autumn seedlings.
(3) Chemical control: When planting in autumn, use 20% of rusting emulsifiable concentrate, 50 ml of water, 2 to 3 kg of water, and 50 kg of mixed wheat, which can reduce the incidence of autumn seedlings. In spring, 50 ml of 20% rusting emulsifiable concentrate is used per acre, and 50-60 kg of water is sprayed. It can also spray 50% powder rusting wettable powder 1000 times liquid or Baume 0.5~0.8 degree stone sulfur mixture. Generally, jointing to booting or heading to the heading spray, spraying once every 7 to 10 days, even spraying 2 to 3 times.
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