Notes on the use of bacterial biological insecticides

Bacterial biological insecticides have the advantages of high insecticidal rate, no environmental pollution, safe to natural enemies, harmless to humans and animals, and do not induce drug resistance to pests. It is a new type of protective agent popularized and used in pollution-free cultivation at present, because its control effect mainly depends on the activity of bacteria in the agent. Therefore, in use, we should pay attention to the following six points: first, do not use inferior chemicals should be purchased from regular manufacturers and pharmaceutical sales points, in order to prevent fake and shoddy, and should pay attention to the production date and service life of the pharmaceutical as well as the reasonable storage and storage of the medicine. to prevent expiration. In addition, the general normal pharmaceutical products have a certain amount of bacteria, there should be no bad smell when opening the lid, and sometimes there will be incense (issued by culture materials), while expired or fake pesticide products often produce peculiar smell or no smell. Second, avoid the use of bacterial biological insecticides at low temperature. The active ingredients are protein crystals and living buds. Under the condition of low temperature, the propagation rate of buds in pests is slow, and protein crystals are not easy to function. The environmental temperature is generally suitable at 10-35 ℃. If it is too low, it will affect the insect food intake, and the control effect is poor. Avoid heavy rain soon after spraying bacterial biological insecticides, in case of moderate to heavy rain, the bacterial solution sprayed on the stems and leaves of crops will be washed away and the efficacy will be reduced. However, if it rains 5 hours after application, it will not reduce the control effect, but will have a synergistic effect. Fourth, avoid mixed use with fungicides when using bacterial biological insecticides, do not mix with fungicides (such as carbendazim, topiramine, etc.), otherwise it will easily lead to a serious reduction in the number of bacteria in the agents, thus affecting the insecticidal effect. As a result, even sprayers that have been sprayed with fungicides have to be rinsed clean before they can be equipped with bacterial bioinsecticides. Fifth, avoid dry environment bacterial buds in biological insecticides like wet environment, so the higher the field humidity, the higher the efficacy, especially when spraying powdered biological pesticides, we should pay more attention to the field humidity. Bacterial powder is usually sprayed in the early morning and evening when there is dew. Sixth, avoid the ultraviolet light in the strong sunlight has a killing effect on the bud, if the strong ultraviolet light will kill the bacteria. Therefore, the spraying of bacterial biological insecticides should be carried out in cloudy days or weak light. The pesticide is usually applied before 10:00 or in the evening on a sunny day.