Bean planting: what is bean powdery mildew?

What is bean powdery mildew? Please introduce the disease and control methods of bean powdery mildew. Bean powdery mildew mainly occurs on the leaves. At the beginning of the disease, there are yellow-brown spots on the back of the leaves, and when enlarged, they show purple-brown spots and are covered with a thin layer of white powder. Powdery mildew is also a fungal disease, which is most likely to occur when there are water droplets on the leaf surface for a long time. Bean powdery mildew can be controlled with reference to the following methods: in the process of daily production management, strengthen ventilation and dehumidification, reasonably control greenhouse temperature, and at the same time do a good job of prevention, such as spraying Dasheng MMel 45, or methyl topiramate wettable powder, etc. Once the disease should be treated in time, Bayer silver is the first choice, and 50% sulfur suspension agent 200 times or Fenbiqing can be selected, and fumigant fumigant can also be used, but attention should be paid to timely ventilation the next day to avoid drug damage. Click to get more bean planting techniques click to get more vegetable planting techniques