Meteorological conditions for the use of bacterial biopesticide

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:

First, pay attention to temperature conditions: the appropriate temperature for the spraying of bacterial bio-pesticide is above 20 °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 not easy to function, and bacterial biologics are applied at 25 ° C - 30 ° C. For pesticides, the potency is 1-2 times higher than that at 10 °C - 15 °C.

Second, pay attention to humidity conditions: make the bacterial biological agent pesticide environment humidity greater drug effect, especially the application of powdered biological pesticides can be fully exerted. 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 there is dew, so as to facilitate the better adhesion of the microbial agents to the base leaves, and promote spore reproduction and improve the efficacy.

Third, pay attention to 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 pesticide after 4 pm or on a cloudy day.

Fourth, pay attention to rain conditions: medium to heavy rain will wash away the bacterial liquid sprayed on the foliage, reducing the efficacy, but if it is light rain for 5 hours, it will not reduce the control effect, but have synergistic effect.

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