Bacterial pesticides have the advantages of high insecticidal efficiency, no pollution to the environment, no poisoning of humans and animals, and no induction of pest resistance. However, many farmers still have unsatisfactory control effects after use. According to the survey, the main reason is that farmers did not follow the requirements of bacterial and pesticides for external conditions. The insecticidal action of bacterial bio-pesticides is related to the number and activity of bacteria. The meteorological conditions are very strict when used. The following problems must be noted: Temperature: The suitable temperature for spraying biological pesticides is 20-30 degrees Celsius. This is because the active ingredients of these pesticides are protein crystals and living spores. At low temperatures, spores are very slow in the growth of pests, and protein crystals are also Not easy to work. The bacterial biological preparation pesticide is applied at 25 to 30 degrees Celsius, and the pharmacological effect is 1 to 2 times higher than that at 10 to 15 degrees Celsius. 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 better adhesion of the microbial agents to the base leaves, and promote Spore reproduction, improve the efficacy. 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 synergistic effect.
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Two Types of Installation
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