Bacterial pesticides are closely related to weather
Bacterial pesticides are biological pesticides with high insecticidal rate, no pollution to the environment, no poisoning of humans and animals, and no resistance to pests. However, the insecticidal action of bacterial pesticides is related to the number and activity of bacteria. When used, the meteorological conditions are very strict. To improve the biological efficacy of bacterial bio-pesticide, the following problems must be paid attention to when using.
Temperature conditions Bacterial biopesticide sprays at a suitable temperature of 20-30 degrees Celsius because the active ingredients of such pesticides are protein crystals and living spores. At low temperatures, spores propagate very slowly in pests, protein crystals are also less likely to act, and bacterial biologics are applied above and below 25-30 degrees Celsius, and the potency is 1-2 times higher than at 10-15 degrees Celsius.
The temperature conditions use bacterial biologic pesticides, and the greater the environmental humidity, the higher the efficacy, especially the powdered biological pesticides. Because the bacterial spores are not resistant to dry environmental conditions, the sprayed bacterial powder should be carried out in the morning and evening when dew is present, so as to facilitate the adhesion of the microbial agent to the base leaves, and promote spore reproduction and improve the efficacy.
Sunlight ultraviolet rays have a killing effect on spores. Direct sunlight exposure for 30 minutes, the spore mortality rate is about 50%, and the mortality rate after exposure for 1 hour is as high as 80%. In addition, ultraviolet radiation also has a deformation-reducing effect on the parasporal crystals. Therefore, it is best to apply the biologic pesticides after 5 pm or on cloudy days.
In the rain conditions, heavy rain will wash away the bacteria sprayed on the foliage, reducing the efficacy. However, if it is light rain after 5 hours of application, it will not only reduce the control effect, but also have a synergistic effect.
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