The use of bacterial pesticides to see five

Bacterial biological pesticides have the advantages of high insecticidal rate, no pollution to the environment, no harm to humans and animals, and no resistance to pests. It is a new type of protective agent that is popularized and used for the pollution-free cultivation of vegetables. Since the weather conditions during use may affect the activity of bacteria in bacterial pesticides and thus affect the control effect, it is necessary to pay attention to the weather conditions in use.

A look at the temperature

The active ingredients of bacterial biopesticides are protein crystals and living spores. At low temperatures, spores reproduce slowly in insects and protein crystals do not work well. According to experiments, the efficacy of bacterial biopesticides applied at temperatures of 25°C to 30°C increased by 1 to 2 times compared with 10°C to 15°C.

Second, look at the humidity

Bacterial biological pesticides in the spores of bacteria and hi humid environment, so the greater the humidity in the field when using the higher the efficacy, especially pesticides spraying powdered biological agents should pay attention to field humidity. Generally, the bacterial powder is sprayed when there is dew in the early morning and early evening so as to facilitate the better adhesion of the bacterial agent to the stems and leaves of the crop, and to promote the propagation of spores and improve the efficacy of the drug.

Three look sunshine

According to tests, direct sunlight for 0.5 hours, the spores mortality rate of about 50%; direct 1 hour, the spores mortality rate of 80%. In addition, UV radiation will degrade parasporal crystals. Therefore, the spraying of bacterial biopesticides should preferably be performed in the evening or on cloudy days.

Four to see the rain

Shortly after the application of bacterial biopesticides, in the event of moderate to heavy rain, the bacterial broth sprayed on the stems and leaves of the crops will be washed away to reduce the efficacy; however, if light rain is applied for 5 hours after the application, it will not only not reduce the Efficiency, but there is a synergistic effect.

Five look at the wind

Bacteria and pesticides are wasted on windy days, especially for powders, and they are more lost. At the same time, windy days are not conducive to the germination of spores. Therefore, bacterial pesticides should be applied on windless or breezy days.

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