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, and the meteorological conditions are very strict when used. To improve the efficacy of bacterial bio-pesticide, the following issues must be noted when using:
I. Temperature conditions: The suitable temperature for the spraying of bacterial bio-pesticides is between 20 °C and 30 °C. This is because the active ingredients of these pesticides are protein crystals and living spores. At low temperatures, spores are very slow in the growth of pests. Protein crystals are also not easy to function. The bacterial biologic pesticides are applied at 25 ° C - 30 ° C, and the pharmacodynamics is 1-2 times higher than that at 10 ° C - 15 ° C.
Second, humidity conditions: the use of bacterial biological agents pesticides, the greater the environmental humidity, the higher the efficacy, especially the application of powdered biological pesticides, because the bacterial spores are not resistant to dry environmental conditions, so spray bacteria powder should have dew in the morning and evening When it is carried out, it is beneficial for the microbial agent to adhere to the base leaf better, and promote spore propagation and improve the drug effect.
Third, the sun conditions: ultraviolet rays in the sun have a killing effect on spores, direct sunlight for 30 minutes, the spore mortality rate of about 50%, the death rate of up to 80% after 1 hour of irradiation. 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.
4. Rainwater conditions: Medium to heavy rain will wash away the bacterial liquid sprayed on the foliage, reducing the efficacy, but if it is light rain after 5 hours of application, it will not reduce the control effect, but have synergistic effect.
Author: Liu
I. Temperature conditions: The suitable temperature for the spraying of bacterial bio-pesticides is between 20 °C and 30 °C. This is because the active ingredients of these pesticides are protein crystals and living spores. At low temperatures, spores are very slow in the growth of pests. Protein crystals are also not easy to function. The bacterial biologic pesticides are applied at 25 ° C - 30 ° C, and the pharmacodynamics is 1-2 times higher than that at 10 ° C - 15 ° C.
Second, humidity conditions: the use of bacterial biological agents pesticides, the greater the environmental humidity, the higher the efficacy, especially the application of powdered biological pesticides, because the bacterial spores are not resistant to dry environmental conditions, so spray bacteria powder should have dew in the morning and evening When it is carried out, it is beneficial for the microbial agent to adhere to the base leaf better, and promote spore propagation and improve the drug effect.
Third, the sun conditions: ultraviolet rays in the sun have a killing effect on spores, direct sunlight for 30 minutes, the spore mortality rate of about 50%, the death rate of up to 80% after 1 hour of irradiation. 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.
4. Rainwater conditions: Medium to heavy rain will wash away the bacterial liquid sprayed on the foliage, reducing the efficacy, but if it is light rain after 5 hours of application, it will not reduce the control effect, but have synergistic effect.
Author: Liu
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