Use biological pesticides seven attention

temperature. The field efficacy of biopesticides varies with increasing or decreasing temperature. For example, Beauveria bassiana is required to control the lepidopteran pests at a temperature of 23-26°C; the control of underground pests, beetles and beaks is 22-25°C, and the control effect is over 80%. The bacteria B. thuringiensis (Bt) control the field temperature of lepidopteran pests at 25-28°C. Plant biological pesticides nicotine preparations, alfalfa preparations field application temperature of 20-33 °C control effect of more than 85%. Therefore, the use of phytochemical pesticides should be adjusted to above 20°C in winter.

humidity. The humidity in the field was too low to germinate spores of unfavorable organisms. In the investigation of the effect of natural parasitic pests of Nomura leyiensis, it was found that two adjacent vegetable fields, one was over-watered, the other was not watered, and a watering one of the cabbage caterpillars, Spodoptera litura, and the beet armyworm were almost completely The death of Nomuraiella nodosum strains was parasitized; the uninhabited vegetable plot had a natural parasitic rate of less than 25%. Therefore, when using fungal or bacterial biopesticides, it is best to spray water before application or after raining.

wind and rain. The use of biological pesticides in windy weather allowed the droplets of bacteria and water to be easily blown away, reducing the effects of parasitic insects; plant pesticides were dispersed and ineffective due to high winds. Rain will wash away the chemicals and reduce the efficacy. Therefore, open cultivation should not use biological pesticides in the case of strong winds and rainfall.

sunlight. Due to the irradiation of ultraviolet rays, bacterial and fungal microbial insecticides will be degraded and degraded under sunlight. Therefore, biological pesticides should not be used in strong sunlight, but should be sprayed on sunny days after 3-4 pm and before dew.

Chemical pesticides. Chemical pesticides have inhibitory effects on the growth of biological pesticide fungi, bacterial spores, mycelium, and spores. Organophosphorus inhibited mycelial growth and spore development by 90%, such as 100% dichlorvos. Therefore, it is best not to formulate biological pesticides mixed with chemical pesticides, so as not to reduce the efficacy. Sprayers that have used chemical pesticides should be cleaned and then loaded with biological pesticides.

water. Diluting biological pesticides should be done with clean river water.

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