First, determine whether the incidence of cucumber. First of all, we can see from the abnormal performance of the outside of the plant. Second, we can judge the disease from the symptoms of the disease on the outside of the plant or the fruit. Finally, let's take a look at whether the disease that occurred was a physiological disease or an infectious disease. The characteristics of general physiological diseases are that the area of ​​occurrence is large and the onset time is relatively uniform, but it is not contagious. Infectious diseases are characterized by the onset of individual plants. Physiological diseases can be mitigated by changing the unfavorable environment for plant growth and by enhancing the plant's resistance to adverse environments. Mixing harvest 800 times at the time of spraying can increase plant resistance and resist adverse growth conditions. Control of infectious diseases First of all, we must eliminate the seed pathogens, seeds and bacteria, can be used hot soaking or chemical seed dressing to eliminate bacteria antivirus, common methods are: 1, soaking in warm water: soak the seeds in warm water at 55 °C for 25 minutes Then cool with cold water and dry to dry. 2. Seed soaking with chemicals: (1) soaking seeds in 100% solution of 40% formalin for 30 minutes, soaking seeds, washing with water, and sowing to dry; (2) soaking seeds in 2-3% bleach solution for 30-60 minutes. After immersion, wash with water; (3) soaking with thiophanate-methyl 800 times for 4 hours. 3. Chemical seed dressing: Use 50% thiram for wettable powder and seed dressing at a seed weight of 0.4%. Secondly, we must choose disease-resistant varieties, like some tomato varieties now have high resistance to leaf mold, anti-roll leaf, resistance to bacterial wilt and so on. Then, it is necessary to promote the healthy growth of plants, plant growth is strong, and disease resistance ability can be enhanced. At the same time, creating an environment conducive to plant growth is also necessary. Second, what is the cause of the disease. When it comes to the cause of morbidity, we must start with the growth environment of cucumbers. Cucumber germs in greenhouses are generally wintered in seeds, soil, and manure and become the source of infection in the next year. Most diseases of cucumber need to be more than 85% of relative humidity. Therefore, one of the main reasons for the serious diseases of cucumber is excessive humidity. Third, how to prevent and control. To prevent and control diseases, we must first create an environment that is suitable for the growth of cucumber, which is not conducive to the growth of pathogens, that is, control the temperature of the greenhouse, reduce the humidity, and use pesticides to prevent disease after the onset of disease. The downy mildew and the epidemic use drugs are basically the same. The commonly used agent is mancozeb , Precle, metalaxyl manganese zinc and other agents. The commonly used fungicides for gray mold include sclerotia, Shijiale, and acetaminophen. The commonly used agents for bacterial blemishes include streptomycin, bacteriol, and dt. Fourth, precautions. (1) Distinguish whether the bactericidal agent is protective or systemic, protect the agent early, carefully spray the medicine, and fight the medicine after the illness. The systemic drug can be used after the onset of disease. (2) Prevention is the main method, prevention and control are combined, and spraying should be based on the word “preventionâ€. (3) It is necessary to mix drugs and use drugs alternately to improve the control effect and prevent drug resistance. (4) To improve the quality of spraying, the back of the blade should be evenly and carefully sprayed, grasp the main contradiction, and spray the key parts according to the characteristics of the disease.
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