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 the weather, the requirements for meteorological conditions are very strict. Attention must be paid to the following issues:
Temperature: The suitable temperature for the spraying of bacterial biopesticides is between 20-30 degrees Celsius. This is because the active ingredients of these pesticides are protein crystals and living spores. At low temperatures, spores propagate very slowly in pests, and protein crystals also Not easy to work. Bacterial biopharmaceuticals were applied at 25-30 degrees Celsius and the efficacy was 1-2 times higher than that at 10-15 degrees Celsius. Humidity: The use of bacterial biological agents for pesticides, the higher the environmental humidity, the higher the efficacy, especially the application of pesticide powdered biological agents, should be carried out in the morning and evening when there is dew, in order to facilitate the bacteria to stick to the base leaf, and promote Spore breeding, improve efficacy.
Humidity: The use of bacterial bio-agent pesticides, the higher the environmental humidity, the higher the efficacy, especially pesticides with powdered biological agents. Because the bacterial spores are not resistant to the dry environmental conditions, it is advisable to spray the bacteria powder in the morning and evening when there is dew, in order to facilitate the bacterial agent to adhere well to the base leaf, and to promote the propagation of spores and improve the efficacy of the drug.
Sunshine: Ultraviolet rays in the sun have a 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: Moderate to heavy rain will flush out the bacterial liquid sprayed on the leaves, reducing the efficacy, but if the light rain after 5 hours of application, will not reduce the control effect, but there are synergies.
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