temperature. The field control of biological pesticides changes with increasing or decreasing temperature. For example, the temperature required for the control of lepidopteran pests by Beauveria bassiana is 23-26 °C; the control of underground pests of cockroaches and cockroaches is 22-25 °C, and the control effect is over 80%. Bacillus thuringiensis (Bt) regulates the temperature of lepidopteran pests at 25-28 °C. The plant bio-pesticide nicotine preparation and alizarin preparation use the temperature of 20-33 °C for more than 85%. Therefore, the use of plant pesticides in winter should adjust the water temperature to above 20 °C.
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humidity. The field wets too low the germination of unfavorable biological spores. In the investigation of the effect of natural parasitic pests of Nomura's wild mushroom, it was found that two adjacent vegetable plots were poured with water and the other without watering. The watering of a cabbage caterpillar, Spodoptera litura and beet armyworm were almost all The wild bacterium of Lai's bacterium is infected with parasitic death; the natural parasitic rate of a vegetable field that is not watered is less than 25%. Therefore, when using fungi or bacterial bio-pesticide, it is best to spray water before use or after rain.
wind and rain. The pesticide network believes that the use of biological pesticides in gale weather, granules and water droplets are easily blown off, reducing the effect of parasitic pests; plant pesticides are scattered and ineffective due to the influence of strong winds. Rainfall will wash away the pharmacy and reduce the efficacy. Therefore, bio-pesticide should not be used in open field cultivation under high winds and rainfall.
sunlight. Because the ultraviolet light will cause the bacterial and fungal microbial pesticides to degrade under the sun, bio-pesticide should not be used under strong sunlight, but should be sprayed after 3-4 pm on sunny days until dew.
Chemical pesticides. Chemical pesticides inhibit the growth of biological pesticide fungi, bacterial spores, hyphae, and spores. Organophosphorus inhibits fungal mycelial growth and spore development by 90%, such as dichlorvos reaching 100%. Therefore, it is best not to mix biochemical pesticides with chemical pesticides, so as not to reduce the efficacy. Sprayers that have used chemical pesticides should be refilled with biopesticides after washing.
water. It is better to dilute the water of biological pesticides with clean river water.