Using Bacterial Biological Pesticides Four Notes
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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. First, pay attention to 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 ratio of bacterial biopesticides applied at a temperature of 25 to 30°C is increased by 1 to 2 times at 10 to 15°C. Second, pay attention to the bacteria in the humidity of biological pesticides in the spores hi humid environment, so the greater the field effect when the humidity is higher, especially when 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 evening, so as to facilitate the fungicides to better adhere to the crop stems and leaves, and to promote the propagation of spores and improve the efficacy of the drug. Third, pay attention to the sun's ultraviolet rays have a killing effect on spores. 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. Fourth, pay attention to the rain after spraying bacterial biological pesticides, in the event of moderate to heavy rain, will be sprayed on the crop stems and leaves leaching off to reduce efficacy; but if the rain after 5 hours of application, not only Does not reduce the effectiveness of control, but there are synergies. Jiangyan City Agricultural Bureau Liu Yuling Shen Xiangming