Bacterial biological pesticides have the advantages of high insecticidal rate, no pollution to the environment, no harm to humans and animals, and no resistance to pests. It is a new type of protective agent that is popularized and used for the pollution-free cultivation of vegetables. Since the weather conditions during use may affect the activity of bacteria in bacterial pesticides and thus affect the control effect, it is necessary to pay attention to the weather conditions in use.
A look at the temperature: The active ingredients of bacterial biopesticides are protein crystals and living spores. At low temperatures, spores reproduce slowly in insects and protein crystals do not work well. According to experiments, the efficacy of bacterial biopesticides applied at temperatures of 25°C to 30°C increased by 1 to 2 times compared with 10°C to 15°C.
Second, look at the humidity: Bacterial biological pesticides in the spores hi humid environment, so the greater the humidity when used in the field, the higher the efficacy, especially spraying pesticide pesticides should pay more attention to field humidity. Generally, the bacterial powder is sprayed when there is dew in the early morning and early evening so as to facilitate the better adhesion of the bacterial agent to the stems and leaves of the crop, and to promote the propagation of spores and improve the efficacy of the drug.
Three to see the sun: According to the test, direct sunlight for 0.5 hours, the spores mortality rate of about 50%; direct 1 hour, the spores mortality rate of 80%. In addition, UV radiation can degrade spore crystals. Therefore, the spraying of bacterial biopesticides should preferably be performed in the evening or on cloudy days.
4 Look at the rain: Shortly after the application of bacterial biopesticides, in case of moderate to heavy rain, the bacilli sprayed on the stems and leaves of the crops will be washed away to reduce the efficacy; however, if light rain occurs after 5 hours of application, not only Does not reduce the effectiveness of control, but there are synergies.
Five look at the wind: Bacteria and pesticides are wasted on a windy day, especially for powders, and they drift more. At the same time, windy days are not conducive to the germination of spores. Therefore, bacterial pesticides should be applied on windless or breezy days.
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