What should be paid attention to in the application of biological pesticides?

What should be paid attention to in the application of biological pesticides? How can bio-pesticides improve their efficacy? Experienced netizens are also asked to introduce that biopesticide is a preparation that uses living organisms (fungi, bacteria, insect viruses, genetically modified organisms, natural enemies, etc.) or their metabolites to kill or inhibit agricultural pests. It also has the characteristics of the effectiveness of pest management and the lowest degree of adverse environmental effects, but biological pesticides are easily affected by external factors in the process of application. Therefore, the farming network collates the matters needing attention in the application of biological pesticides, which are listed below for netizens' reference. First, the temperature requirements of biological pesticides: because the active components of biological pesticides are mainly composed of protein crystals and living spores, the temperature requirements are higher. Therefore, when using biological pesticides, the temperature must be controlled above 20 ℃. Once the biological pesticide is sprayed below the optimum temperature, the speed of spore reproduction is very slow, and it is difficult for protein crystals to play its role, and it is often difficult to achieve the best control effect. The results showed that the control effect of biopesticide at 20-30 ℃ was 1-2 times higher than that at 10-15 ℃. For this reason, it is necessary to master the optimum temperature to ensure the control effect of spraying biological pesticides. Second, the requirements of biological pesticides on humidity: biological pesticides are very sensitive to the requirements of humidity. The greater the humidity of the farmland environment, the more obvious the efficacy, especially the powdered biological pesticides. Therefore, when spraying bacterial powder, we must firmly grasp the morning and evening when the dew is just dry, and when it is used on edible agricultural products such as vegetables, melons and fruits, we must make sure that the agent can be evenly sprayed on the stems, leaves and leaves, so that the biological bacteria can propagate rapidly and produce drug effect immediately. play a very good control effect. Third, biological pesticides should avoid strong light: because the ultraviolet rays in the sun have a fatal killing effect on biological bacteria. Scientific experiments have proved that the death rate of biological bacteria can reach 30% and more than 50% after direct exposure to the sun for 60 and 120 minutes, and ultraviolet radiation can deform and reduce the efficiency of parasporal crystals. Therefore, avoid strong sunlight, enhance the vitality of biological bacteria, and give full play to the effect of biological bacteria control. Fourth, the application of biological pesticides should avoid being washed by rain: biological agents are most afraid of rainstorm, which will wash away the bacterial liquid sprayed on vegetables, melons, fruits and other crops, affecting the lethality to bacteria. If there is light rain 8 hours after spraying, it is beneficial to the rapid propagation and decomposition of biological bacteria, speed up the killing of harmful bacteria, and improve the control effect. To this end, agricultural technicians in various places are required to guide farmers to use biological pesticides according to the local weather forecast, make good use of biological pesticides in a timely manner, and strictly prohibit the use of drugs during rainstorms to ensure their killing effect. What diseases can be prevented by fungicides? what should be paid attention to when using fungicides?