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Use biopesticides to select the weather
Bacterial pesticides are biological pesticides with high insecticidal rates, do not pollute the environment, do not poison humans and animals, and do not induce pest resistance. However, the insecticidal effect of bacterial pesticides is related to the number and activity of bacteria. When using weather conditions, the requirements are very strict and the following issues must be noted: Temperature conditions Bacterial bio-pesticides are suitable for spraying at 20-30 degrees Celsius, because this The active ingredients of pesticides are protein crystals and living spores. At low temperatures, spores propagate very slowly in insect pests, and protein crystals are not easily affected. The application of bacterial biological pesticides at 25-30 degrees Celsius is 1-2 times higher than that at 10-15 degrees Celsius. Humidity conditions using bacterial biological agents The higher the humidity of the pesticide environment, the higher the efficacy, especially the application of pesticide powdered biological agents, should be carried out in the morning and evening dew, in order to facilitate the bacterial agent to stick to the base leaf, and promote spores Reproduction, improve efficacy. Sunshine conditions The ultraviolet rays in sunlight have killing effect on spores. Direct sunlight for 30 minutes, the spores mortality rate of about 50%, the mortality rate of up to 80% in 1 hour irradiation. Therefore, it is best to apply biopesticides after 5 pm or on cloudy days. Rainwater conditions, moderate to heavy rain, will flush out the bacterial liquid sprayed on the leaves, reducing the efficacy, but if light rain occurs after 5 hours of application, the control effect will not be reduced, but there will be a synergistic effect.