Under what weather conditions is it better to apply bacterial biological pesticides?

Biological pesticides are compounds produced by organisms with pesticide biological activity. This also includes some simple derivatives of these natural products, that is, chemically modified products. The accurate formula of biological pesticides should be biological pesticides, including plant, microbial and animal pesticides. Many biological pesticides have not made great progress for decades, mainly because of their low efficacy, which is incomparable to chemical pesticides that are often opposed.

? Bacterial pesticides are biological pesticides derived from microorganisms. High insecticidal rate, no environmental pollution, no toxicity to people and animals, and no induction of drug resistance of pests. It is a new type of pesticide popularized and applied in pollution-free cultivation of vegetables at present. But the insecticidal effect of bacterial pesticides is related to the number and activity of bacteria. Weather conditions will directly affect the bacterial activity of bacterial pesticides in the process of use, thus affecting the effect. Therefore, we must pay special attention to weather conditions such as temperature, humidity, sunshine and rain.

1, temperature: the suitable temperature for spraying bacterial biological pesticides is 20-30 degrees Celsius. This is because the active ingredients of these pesticides are protein crystals and live spores. At low temperature, spores propagate very slowly in pests, and protein crystals are not easy to take effect. When bacterial biopesticide is used at 25-30℃, its efficacy is twice as high as 10- 15℃ 1-2 times.

2. Humidity: When using bacterial biopesticides, the higher the environmental humidity, the higher the efficacy, especially the application of powdery biopesticides should be carried out when there is dew in the morning and evening, so that bacteria can better adhere to the basal leaves. Promote spore reproduction and improve drug efficacy.

3. Sunlight: Ultraviolet rays in sunlight can kill spores. After 30 minutes of direct sunlight, the spore mortality rate reached about 50%, and the exposure 1 hour mortality rate was as high as 80%. Therefore, biological pesticides should be used after 5 pm or on cloudy days.

4. Rain: moderate to heavy rain will wash away the bacterial liquid sprayed on the leaves and reduce the efficacy. However, if it rains 5 hours after application, it will not reduce the control effect, but will reduce the efficacy. There is synergy.