Bacterial bio-pesticide has the advantages of high insecticidal rate, no pollution to the environment, harmless to humans and animals, and no resistance to pests. It is a new type of protective agent that is currently used in the pollution-free cultivation of vegetables. Since the weather conditions during use affect the bacterial activity in the bacterial pesticides, which affects the control effect, it is necessary to pay attention to the weather conditions at the time of use.
Look at the temperature
The active constituents of bacterial biopesticide are protein crystals and living spores. Under low temperature conditions, spores are slow to propagate in pests, and protein crystals are not easy to function. According to the test, the efficacy of applying bacterial bio-pesticides at temperatures between 25 ° C and 30 ° C is 1 to 2 times higher than that at 10 ° C to 15 ° C.
Second look at humidity
The spores of bacteria in bacterial bio-pesticides are in a humid environment. Therefore, the greater the humidity in the field, the higher the efficacy, especially the spraying of powdered biological pesticides should pay attention to the field humidity. Generally, the bacteria powder is sprayed when there is dew in the morning and evening, so as to facilitate the adhesion of the microbial agent to the stems and leaves of the crop, and promote the spore propagation and improve the efficacy.
Three look at the sun
According to the test, direct sunlight for 0.5 hours, the spore mortality rate is about 50%; direct radiation for 1 hour, the spore mortality rate is 80%. In addition, ultraviolet radiation can degrade the parasitic crystals. Therefore, spraying biological pesticides should be carried out in the evening or on cloudy days.
Four watching the rain
Shortly after spraying the biological pesticides, in the event of heavy rain, the bacteria sprayed on the stems and leaves of the crops will be washed away to reduce the efficacy; but if it rains 5 hours after the application, it will not reduce the prevention. Efficiency, but has synergy.
Five look at the wind
Bacterial pesticides are wasteful in windy days, especially powders, which are lost more. At the same time, windy days are not conducive to the germination of spores. Therefore, bacterial pesticides should be applied in the absence of wind or breeze.
Look at the temperature
The active constituents of bacterial biopesticide are protein crystals and living spores. Under low temperature conditions, spores are slow to propagate in pests, and protein crystals are not easy to function. According to the test, the efficacy of applying bacterial bio-pesticides at temperatures between 25 ° C and 30 ° C is 1 to 2 times higher than that at 10 ° C to 15 ° C.
Second look at humidity
The spores of bacteria in bacterial bio-pesticides are in a humid environment. Therefore, the greater the humidity in the field, the higher the efficacy, especially the spraying of powdered biological pesticides should pay attention to the field humidity. Generally, the bacteria powder is sprayed when there is dew in the morning and evening, so as to facilitate the adhesion of the microbial agent to the stems and leaves of the crop, and promote the spore propagation and improve the efficacy.
Three look at the sun
According to the test, direct sunlight for 0.5 hours, the spore mortality rate is about 50%; direct radiation for 1 hour, the spore mortality rate is 80%. In addition, ultraviolet radiation can degrade the parasitic crystals. Therefore, spraying biological pesticides should be carried out in the evening or on cloudy days.
Four watching the rain
Shortly after spraying the biological pesticides, in the event of heavy rain, the bacteria sprayed on the stems and leaves of the crops will be washed away to reduce the efficacy; but if it rains 5 hours after the application, it will not reduce the prevention. Efficiency, but has synergy.
Five look at the wind
Bacterial pesticides are wasteful in windy days, especially powders, which are lost more. At the same time, windy days are not conducive to the germination of spores. Therefore, bacterial pesticides should be applied in the absence of wind or breeze.
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