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 such as weather and sunlight are very strict when used. To improve the efficacy of bacterial bio-pesticide, the following issues must be noted when using:
Temperature condition
The suitable temperature for the spraying of bacterial bio-pesticide is 20 °C ~ 30 °C, because the active ingredients of this kind of pesticide are protein crystals and living spores. At low temperature, spores are very slow in the growth of pests, and protein crystals are not easy to occur. effect. Tests have shown that bacterial biologic pesticides are applied at 25 ° C to 30 ° C, and the pharmacodynamics ratio is 1 to 2 times higher than that at 10 ° C to 15 ° C.
Humidity condition
The use of bacterial biologics 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 sprayed bacteria powder should be carried out in the morning and evening when there is dew. In order to facilitate the bacterial agent to adhere to the base leaf, and promote spore reproduction, improve drug efficacy.
Sunlight condition
Ultraviolet rays in the sun have a killing effect on spores, direct sunlight for 30 minutes, spore mortality of about 50%, and mortality of up to 80% after 1 hour of irradiation. In addition, ultraviolet radiation also has denaturing and reducing effects on spore crystals. Therefore, it is best to apply the biologic pesticides after 5 pm or on cloudy days.
Rain conditions
Medium to heavy rain will wash away the bacteria sprayed on the foliage, reducing the efficacy, but if it rains 5 hours after application, it will not reduce the control effect, but have synergistic effect.
This article URL: Four conditions for the use of bacterial biopesticide
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