Vegetable production powdery mildew appears widespread, if not control, seriously affecting vegetables and reduce income. Powdery mildew is mainly harmful to the leaves. At the early stage of the disease, irregular chlorotic yellow spots appear on the leaves, and white small mildew spots appear in the corresponding parts of the leaf back. Afterwards, the number of lesions increases, and the white powder is increasingly obvious and white powder spots. Having said that powdery mildew, surely we are also commonplace. Powdery mildew has a wide range of hazards, covering all types of vegetables, from the field to the greenhouse, from the vegetable garden to the orchard, where it can be seen everywhere. So how to scientifically and correctly prevent powdery mildew, thereby reducing the economic losses it brings to farmers and friends? Xiaobian will give you a detailed explanation. Main characteristics of powdery mildew Note that, different crops, powdery mildew pathogens are also different. Aside from a handful of powdery mildew pathogen, most of the powdery mildew pathogen can infect only one or two crops. Moreover, due to the stubborn vitality of the powdery mildew pathogen, it is easy to produce drug resistance, which leads to a higher difficulty in controlling powdery mildew. 1 Symptoms: There are white or gray-white powders (conidia, conidiophores and hyphae) on the infected part, and small black spots (closed capsules) are formed on the surface of the susceptible parts later in the disease. 2 Causes of the disease: Powdery mildew forms conidia, which requires higher temperature and relative humidity. If the light is insufficient, it is also conducive to the development of the bacteria. In addition, the parasitic ability of powdery mildew is very strong. Powdery mildew can invade the epidermis of crop organs from the pores of the pores of crops. Therefore, the epidermis of the organs is thin and tender, and the plants with high nitrogen nutrition and fast growth rate are easily targeted by powdery mildew. . If the planting density is unreasonable, or the pruning is unreasonable, it will lead to the closure of the branches and leaves, and it will also create an invasion opportunity for powdery mildew. At the same time, if the ventilation is poor, it will have some impact. Scientific prevention of powdery mildew In summary, we have the right medicine. 1 Variety selection: Choosing excellent varieties of seeds is the first step for our high-yield and healthy planting. 2 Improve the environment: The environment with poor ventilation, weak light and high relative humidity of the air must be changed accordingly. Try to improve the light level, reduce the air humidity, and strengthen the ventilation. These work can not be done less. 3 Reasonable topdressing: Keep an eye on the growth of crops, balance fertilization, and timely supplement calcium fertilizer and silicon fertilizer, which will help improve the disease resistance of crops. 4 chemical control: Because the propagation of powdery mildew is fast, so in the early stage of the disease, we must start to prevent it. Timely control of the number of germs is of great help to our planting management. Try not to make up for it. Here to remind everyone: medication should also pay attention to rotation medication, to avoid the emergence of resistance to bacteria. In the choice of medication, you can choose sulfur, mancozeb, which has a good contact protection effect, suitable temperature for planting environment can be used; difenoconazole, propiconazole has good prevention and treatment effect However, due to its strong efficacy, it is recommended to use it in combination with other fungicides. When using the drug, the concentration should be low, the amount of water should be large, and the leaf surface should be completely wetted. But also pay attention to balance the surrounding environment, if the humidity is too high, it is easy to cause other diseases. Also do a good job of powdery mildew prevention measures 1. Planting vegetables in the field should be cultivated with suitable varieties that are suitable for local cultivation and strong in disease resistance, and strict selection should be made to avoid the introduction of carrier seeds. Reasonable close planting, spraying new high-fat membranes at the appropriate time after seedlings are unearthed to protect plants and isolate infections. 2. Strengthen the management of water and fertilizer in the field, increase the application of phosphorus and potassium fertilizer, and spray the vegetables with strong stems and leaves to increase the water absorption and fertilizer absorption of the plants, promote the growth of vegetable seedlings, thick stems, thick leaves and enhanced disease resistance. Timely removal of field diseased leaves, withered leaves, weeds, etc., and concentrated out of field destruction, in order to effectively reduce the source of powdery mildew in the field. 3, powdery mildew in the early stage of the use of targeted drugs for prevention and control, can be used in combination with the new high-fat film, to improve the control effect, control the volatile and elegant pesticides, prevent rainwater wash. 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