Winter vegetable production has become one of the most important ways for farmers to increase their income. The cultivation of greenhouses has increased the yield and quality of vegetables. Cucumber is a major greenhouse vegetable variety. Due to the application of greenhouses, it has changed the microclimate and ecological environment in the field. High temperature and high humidity are favorable to the downy mildew. Disease occurs. Therefore, prevention and control of downy mildew is an indispensable task for cucumber production and management. The prevention and control technology of cucumber downy mildew should be combined with chemical control and agricultural control. First of all, according to the climatic conditions, do a good job ventilation and ventilation work in greenhouses, reduce the humidity in the field; timely removal of the old cucumber leaves, to reduce the re-infection. Second, choose a good type of agent, the right medicine. At present, commonly used pharmaceutical agents can be used: Propocarb, nitrilazole, Ami colorful, etc. Note that the use of drugs should be used alternately to improve the control effect. Liporase Hyaluronidase Injectable,Lyophilized Hyalronidase Injection ,1500U Injectable Hyaluronidase ,Hyaluronidase Injection Jiangsu Tiera Biotechnology Co., Ltd , https://www.tierabio.com