What are the main points that should be noted when spraying bacterial bio-pesticides?

A biological pesticide is a biologically active compound having a biological activity of a pesticide. The accurate reference for biological pesticides should be biologically derived pesticides, including plant sources, microbial sources and animal-derived pesticides. 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 for the promotion and pollution-free cultivation of vegetables. What should I pay attention to when using bacterial bio-pesticide?

The insecticidal action of bacterial pesticides is related to the number and activity of bacteria. The weather conditions in use will directly affect the bacterial activity in bacterial pesticides, thus affecting the effect. Therefore, special attention should be paid to the temperature, humidity, sunlight, rain and other weather when using. condition.

First, the temperature is suitable

The suitable temperature for spraying bacterial bio- pesticide is 20-30 °C. This is because the active ingredients of this kind of pesticide are protein crystals and living spores. At low temperature, spores are very slow in the growth of pests, and protein crystals are not easy to occur. effect. The bacterial biological preparation is applied at 25 to 30 °C.

Second, the humidity is big

The use of bacterial biologics pesticides, 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 with dew, in order to facilitate the bacterial agent to adhere to the base leaves and promote spore reproduction To improve the efficacy of the drug.

Third, avoid the sun

Ultraviolet rays in the sun have a killing effect on spores. Direct 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.

Fourth, avoid heavy rain

Medium to heavy rain will wash away the bacteria sprayed on the foliage, reducing the efficacy, but if it rains 5 hours after application, it will not reduce the control effect, but has a synergistic effect.

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