1. Grasp the temperature. The activity of microbial pesticides is directly related to the temperature, and the suitable temperature of the use environment should be above 15°C and below 30°C. Below a suitable temperature, the sprayed biological pesticides have a slow rate of reproduction in insect pests and are difficult to exert, resulting in poor efficacy of the product. In general, the control effect of microbial pesticides at 20-30°C is 1-2 times higher than that between 10-15°C.
2. Grasp the humidity. The activity of microbial pesticides is closely related to the humidity. The greater the humidity of the farmland environment, the more obvious the efficacy of pesticides, especially for powdered microbial pesticides. It is best to apply pesticides when the dew is not yet dry in the morning and evening, so that the microorganisms can multiply quickly and play a better control effect.
3. Avoid glare. Ultraviolet light has a lethal killing effect on microbial pesticides. In direct sunlight for 30 minutes and 60 minutes, the microbial mortality rate can reach 50% and 80%. It is best to use cloudy or late evening application.
4. Avoid rain wash. After the spraying, light rain is encountered, which is conducive to the reproduction of active tissues in microbial pesticides without affecting the efficacy. However, heavy rain will flush out the liquid sprayed on the crops, affecting the control effect. According to the local weather forecast, timely application of pesticides to avoid heavy rain and heavy rain to ensure the insecticidal effect.
In addition, virus-based microbial pesticides are highly specific and generally only act on one pest and have no effect on other pests. For example, diamondback moth particle virus can only be used to control diamondback moth. Before use, it is necessary to investigate the occurrence of insect pests in the field, and to arrange the period of prevention and treatment according to the occurrence of pests, and to use drugs in a timely manner.
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