    The control of wheat powdery mildew should pay attention to the following points:
Wheat powdery mildew is a global disease. After the damage of large wheat, the leaves are prematurely dried, the rate of ear formation is reduced, the weight of 1000 grains is reduced, and the loss of serious land is as high as 20%-30%. Powdery mildew mainly harms leaves and sheaths. Usually, the leaf surface lesions are more than the leaf back, and the lower leaves are more severe than the upper leaves. The early stage of the lesion is a small yellow spot, and then gradually enlarges into a round or elliptical lesion with a layer of white powdery mildew on the surface. The later mildew layer turns grayish or taupe, with many black dots on it (closed capsule) shell). When the lesions are long, they can heal into pieces, and cause the leaves to yellow and die. After the stems and sheaths are damaged, the plants are easy to fall.
Therefore, targeted drug control should be used in time to control the spread of disease, vines and hazards in the middle and late stages. It is recommended that the choice of pharmaceutical agents must be targeted and used in conjunction with the new high-fat membrane. The high-toxic pesticides can be modified for poisoning, the poisoned pesticides are low-toxic, and the low-toxic pesticides are slightly toxic. Control the volatile and volatile pesticides, prevent the rainwater from scouring, reduce the dosage per acre (half), and improve the control effect (multiple times).
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