Pesticides biological pesticides known bacterial, insecticidal rate, does not pollute the environment, is not toxic to humans and animals, without inducing pest resistance. The insecticidal action of biological pesticides is mainly related to the number of bacteria and its activity. The environmental conditions are very strict when used. To improve the control effect of biological pesticides, the following points should be noted when using:
1. Pay attention to the temperature conditions:
The suitable temperature for spraying pesticides in biological preparations is above 20 °C, because the active ingredients of biological pesticides are protein crystals and living spores. At low temperatures, spores propagate slowly in pests, and protein crystals are not easy to function. According to experimental research, the efficacy is about 2 times higher than that of 10-15 °C at 25-30 °C.
2. Pay attention to humidity conditions:
The use of biological pesticides , the greater the environmental humidity, the higher the efficacy, especially when using powdered biological agents, only under high-humidity conditions, the efficacy can be fully exerted. The reason is that the spores of the bacteria are not resistant to dry environmental conditions. Therefore, the spraying of the bacteria powder should be carried out in the morning and evening when there is dew, so that the microbial agent can adhere well to the stems and leaves, and promote the spore reproduction, increase and Opportunities for pests to come into contact.
3. Pay attention to the sunshine conditions:
The ultraviolet rays in the sunlight have the effect of killing spores, and the ultraviolet rays also have the effect of deforming and reducing the effect on the parasporal crystals. In order to avoid the destruction of ultraviolet rays in the sun, it is best to apply after 4 pm or on cloudy days. Adding raw sugar or corn puree to pesticides has a certain effect on filtering ultraviolet rays.
4. Pay attention to rain conditions:
Medium to heavy rain will wash away the bacteria sprayed on the leaves, reducing the efficacy. However, if it rains 5 hours after application, it will increase the efficacy, because then the light rain will be beneficial to the spore activity, which will accelerate the death of the pest.
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