Bacterial pesticides are a kind of microbial source preparation pesticides in biological pesticides . They have high insecticidal rate, do not pollute the environment, do not poison humans and animals, and do not induce pest resistance. It is a new type of medicament that is currently used in the pollution-free cultivation of vegetables. However, the insecticidal action of bacterial pesticides is related to the number and activity of bacteria. The weather conditions during use will directly affect the bacterial activity in bacterial pesticides, thus affecting the effect. Pay special attention to weather conditions such as sunlight, temperature, humidity, and rain during use.
Sunlight has a killing effect on spores due to ultraviolet rays in the sun. Sunlight exposure for 30 minutes, the spore mortality rate of about 50%, the death rate of up to 80% after 1 hour of irradiation. Therefore, it is best to apply the biologic pesticides after 5 pm or on cloudy days.
Temperature Because the active ingredients of such pesticides are very slow at low temperatures, protein crystals are less likely to act. Therefore, the suitable temperature for spraying the biological biopesticide is 20 to 30 ° C, and the bacterial biological preparation pesticide is applied at 25 to 30 ° C, and the pharmacodynamic effect is 1 to 2 times higher than that at 10 to 15 ° C.
The use of bacterial biologics pesticides in humidity, the greater the environmental humidity, the higher the efficacy, especially the application of powdered biological pesticides, should be carried out in the morning and evening when there is dew, in order to facilitate the better adhesion of the microbial agents to the base leaves and promote spores Reproduce and improve the efficacy.
Rainwater to heavy rain will wash away the bacteria sprayed on the foliage, reducing the efficacy, but if it rains after 5 hours of application, it will not reduce the control effect, but has a synergistic effect.
Tips for China Pesticide Network : It seems that the use of bacterial bio-pesticide, the weather is very important, directly affecting the use of pesticides. Farmers’ friends should always be concerned about the weather conditions in order to achieve twice the result with half the effort.
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