The use of bacterial biological pesticides should pay attention to the weather

Biopesticides are biologically-produced compounds with biological activity of pesticides. The exact formulation of biological pesticides should be bio-sourced pesticides, including plant-derived, microbial, and animal-derived pesticides. The primary reason why many biopesticides have not been developed for decades is that their efficacy is not high and they cannot be compared with chemical pesticides that are often opposed. Followed by instability, because it is not resistant to storage, rapid decomposition of light in the field and other reasons, only the current system and difficult to scale. Therefore, in the use of biological pesticides, especially bacterial pesticides should pay more attention to the weather.

Bacterial pesticide is a kind of microbial pesticide in biological pesticides. It has a high insecticidal rate, does not pollute the environment, does not poison humans and animals, and does not induce pest resistance. It is a new type of pesticide that is currently popularized for the cultivation of non-polluted vegetables. However, the insecticidal effect of bacterial pesticides is related to the number and activity of bacteria. Weather conditions during use will directly affect the activity of bacteria in bacterial pesticides and thus influence the effect. Therefore, special attention must be paid to temperature, humidity, sunlight, rain, etc. during use. Weather condition.

temperature

The suitable temperature for the application of bacterial biopesticides is between 20°C and 30°C. This is because the active ingredients of these pesticides are protein crystals and living spores. At low temperatures, spores propagate very slowly in pests and protein crystals are not prone to occur. effect. The bacterial biopesticides were applied at 25-30°C, and the drug efficacy was 1-2 times higher than that at 10-15°C.

humidity

The use of bacterial biological pesticides, the higher the environmental humidity the higher the efficacy, especially the application of powdered biological pesticides, should be carried out in the morning and evening with dew, in order to facilitate the bacteria stick to the base leaf, and promote spores reproduction Improve efficacy.

sunlight

Ultraviolet rays in the sun have a killing effect on spores. Direct sunlight for 30 minutes, the spores mortality rate of about 50%, the mortality rate of up to 80% in 1 hour irradiation. Therefore, it is best to apply biopesticides after 5 pm or on cloudy days.

rainwater

Moderate to heavy rain will flush out the bacterial liquid sprayed on the leaves, reducing the efficacy, but if the light rain after 5 hours of application, will not reduce the control effect, but there are synergies.

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