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. The primary reason why many biological pesticides have not been developed for decades is that they are not effective and cannot be compared with chemical pesticides that are often opposed. Secondly, it is unstable, because it is not resistant to storage, and it is quick to decompose in the field. It is difficult to scale only with the current system. Therefore, the use of biological pesticides, especially bacterial pesticides, should pay more attention to the weather.
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 that is currently used in the pollution-free cultivation of vegetables. However, insecticidal pesticides bacterial number and activity related to the bacterium, the use of weather conditions directly affect the bactericidal activity of bacterial pesticide, thereby affecting the results, thus requiring special attention to the temperature, humidity, sunlight, rain, etc. during use Weather condition.
temperature
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 pesticide is applied at 25 to 30 ° C, and the pharmacodynamic effect is 1 to 2 times higher than that at 10 to 15 ° C.
humidity
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.
sunlight
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.
rainwater
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.
More pesticide knowledge , please pay attention to China Pesticide Network
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