Application effect of bacterial pesticides and meteorological conditions

Bacterial pesticides are a class of biological agents, and the insecticidal effect is closely related to the number and activity of bacteria. When used, there are strict requirements for meteorological conditions. Therefore, the following meteorological conditions must be observed when using bacterial pesticides: 1. Temperature. A suitable temperature for using a bacterial pesticide is 20 ° C or higher. If the temperature is low, the active spores of the bacterial pesticides are slow to propagate in the pests, and the active proteins are not easy to function. Second, humidity. When using bacterial pesticides, the greater the environmental humidity, the higher the efficacy, especially the application of powdery bacterial pesticides. Third, the sun. The ultraviolet rays in the sun have a killing effect on spores. If the sunlight directly irradiates the bacterial pesticide for 30 minutes, the spores will die 50%, and the bacterial pesticide will be irradiated for 1 hour, and the mortality rate can be as high as 80%. In addition, ultraviolet radiation also has a deformation-reducing effect on the parasporal crystals. Therefore, bacterial pesticides should be applied after 4 pm or on cloudy days. Fourth, rain. Heavy rain will reduce the efficacy after application, but drizzle 5 hours after application will not only reduce the efficacy, but also increase the efficacy of bacteria and pesticides. Source: Rural Volkswagen

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