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 ratio of applying bacterial biopesticides at temperatures of 25°C to 30°C is increased by 1 to 2 times at 10°C to 15°C.
Second, look at the bacterial spores in wet biological biological pesticides and hi humid environment. Therefore, the higher the field humidity is, the higher the efficacy is, and especially the spraying of powdered biological agents should pay attention to the 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.
According to tests conducted by the Sun, the direct spleen exposure to sunlight for 0.5 hours caused a mortality rate of about 50% for spores and an 80% rate for direct spattering for 1 hour. 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, after seeing the rain sprayed with bacterial biopesticides, in the event of moderate to heavy rain, the bacterial broth sprayed on the crop stems and leaves will be washed away to reduce the efficacy; but if it rains after 5 hours, it will not only not Will reduce the effectiveness of control, but there are synergies.
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