Bacterial biopesticides are the new type of protective agents that are popularized and used in the current pollution-free cultivation of vegetables. Since the weather conditions during use will directly affect the activity of bacteria in the bacterial pesticide and thus affect the effect, special attention must be paid to the weather conditions during use.
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 ratio of bacterial biopesticides applied at a temperature of 25 to 30°C is increased by 1 to 2 times at 10 to 15°C.
Humidity Bacteria The biological spores of bacteria in biological pesticides prefer a humid environment. Therefore, the greater the humidity in the field and the higher the efficacy, the more attention should be paid to the field humidity when spraying powdered biological agents. Generally, the bacterial powder is sprayed when there is dew in the early morning and evening, so as to facilitate the fungicides to better adhere to the crop stems and leaves, and to promote the propagation of spores and improve the efficacy of the drug.
The sun's ultraviolet rays have a killing effect on spores. According to tests, 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 will degrade parasporal crystals.
Therefore, the spraying of bacterial biopesticides should preferably be performed in the evening or on cloudy days.
Shortly after the spraying of bacterial biopesticides in the rain, in case of moderate to heavy rain, the bacterial broth sprayed on the stems and leaves of the crops will be washed away to reduce the efficacy; however, if it rains after 5 hours of application, it will not only not reduce. Control efficiency, but there are synergies.
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