Bacterial pesticide is a kind of biological pesticide with high insecticidal rate, does not pollute the environment, does not poison humans and livestock, and does not induce pests to produce resistance. However, the insecticidal effect of bacterial pesticides is related to the number and activity of bacteria, and the requirements for meteorological conditions such as weather and sunlight are very strict when they are used. In order to improve the control effectiveness of bacterial biological pesticides, the following issues must be paid attention to when using:
1, Temperature conditions
The suitable temperature of bacterial biological pesticide spraying is 20 °C ~ 30 °C, this is because the active ingredients of this type of pesticide are protein crystals and living spores, at low temperatures, the spores reproduction rate in the pest is extremely slow, and protein crystals are not easy to function. The test showed that the application of bacterial biological agents pesticides at 25 °C~30 °C was 1~2 times higher than that at 10 °C~15 °C.
2, Humidity conditions
The use of bacterial biological agents, the greater the environmental humidity, the higher the efficacy, especially the application of powdered biological agents, because the spores of bacteria are not resistant to dry environmental conditions, therefore, spraying bacterial powder should be carried out in the morning and evening when there is dew, so as to facilitate the bacteria to stick to the basal leaf better, and promote the reproduction of spores, improve the efficacy.
3. Sunlight conditions
Ultraviolet rays in sunlight have a killing effect on spores, and the mortality rate of spores is about 50% after 30 minutes of direct sunlight, and the mortality rate is as high as 80% after 1 hour of irradiation. In addition, ultraviolet radiation also has a degenerative effect on spore crystals. Therefore, it is best to apply biologic pesticides after 5 p.m. or on cloudy days.
4, rainwater conditions
Moderate to heavy rain will wash away the bacterial liquid sprayed on the leaves, reducing the efficacy, but if it rains lightly after 5 hours of application, it will not only not reduce the control effect, but will have a synergistic effect.
Bacterial organisms and pesticides should be introduced here to pay attention to the weather before application, and I hope it will be helpful to everyone. If you want to buy high-quality and high-yield vegetable seeds, you can download the seed bank App, and the country's excellent vegetable varieties are available for everyone to choose.
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