Proper use of biological pesticides
2018-08-10 11:03:52
Bio-pesticide is known as a green pesticide because it is non-toxic, does not pollute the environment, and is not easy to produce drug resistance. It has broad development prospects. At present, many pesticides have been accepted or used in many places in our province, but the following problems must be paid attention to when using them.
One is the temperature. The suitable temperature for spraying biopesticide is above 20 °C. Because the active ingredients of such pesticides are protein crystals and living spores, spores in the low temperature reproduce very slowly in the pests, and protein crystals are not easy to function. According to tests, the application of bio-pesticides at 25 ° C to 30 ° C is about twice as high as that at 10 ° C to 15 ° C.
The second is humidity. The use of biological pesticides, the higher the environmental humidity, the higher the efficacy, especially the application of powdered biological agents, only under high-humidity conditions can be fully exerted. The reason is that the buds of the bacteria are not resistant to dry environmental conditions. Therefore, spraying the bacterial powder should be carried out in the morning and evening with dew, so that the microbial agent can adhere to the stems and leaves, and promote spore reproduction and increase the chance of contact with the pests.
The third is sunshine. Ultraviolet rays in the sun have a killing effect on spores. Direct sun exposure for 30 minutes can kill 50% of the spores. After 1 hour of irradiation, the mortality rate is as high as 80%, and the ultraviolet radiation also has a deformation-reducing effect on the protein crystals. Therefore, choose to use bio-pesticide after 4 pm or on cloudy days.
The fourth is rain. Medium to heavy rain will wash away the bacteria sprayed on the leaves, reducing the efficacy, but if it is light rain 5 hours after application, it will not reduce the efficacy, but will improve the control effect. Because light rain is good for spore activity, the insect will accelerate its death after eating.
One is the temperature. The suitable temperature for spraying biopesticide is above 20 °C. Because the active ingredients of such pesticides are protein crystals and living spores, spores in the low temperature reproduce very slowly in the pests, and protein crystals are not easy to function. According to tests, the application of bio-pesticides at 25 ° C to 30 ° C is about twice as high as that at 10 ° C to 15 ° C.
The second is humidity. The use of biological pesticides, the higher the environmental humidity, the higher the efficacy, especially the application of powdered biological agents, only under high-humidity conditions can be fully exerted. The reason is that the buds of the bacteria are not resistant to dry environmental conditions. Therefore, spraying the bacterial powder should be carried out in the morning and evening with dew, so that the microbial agent can adhere to the stems and leaves, and promote spore reproduction and increase the chance of contact with the pests.
The third is sunshine. Ultraviolet rays in the sun have a killing effect on spores. Direct sun exposure for 30 minutes can kill 50% of the spores. After 1 hour of irradiation, the mortality rate is as high as 80%, and the ultraviolet radiation also has a deformation-reducing effect on the protein crystals. Therefore, choose to use bio-pesticide after 4 pm or on cloudy days.
The fourth is rain. Medium to heavy rain will wash away the bacteria sprayed on the leaves, reducing the efficacy, but if it is light rain 5 hours after application, it will not reduce the efficacy, but will improve the control effect. Because light rain is good for spore activity, the insect will accelerate its death after eating.
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