It is closely related to the humidity and the activity of microbial pesticides. The higher the general ambient humidity is, the more obvious the drug efficacy is and the more so is the powdery microbial pesticide. 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.
Grasp the temperature Microbiological pesticides activity is directly related to the temperature, the appropriate temperature for the use of the environment should be above 15 °C, 30 °C below. 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.
Avoid rain after spraying, which is conducive to the reproduction of active tissues in microbial pesticides, and will not affect 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.
Avoid the strong killing effect of ultraviolet light on microbial pesticides. In direct sunlight for 30 to 60 minutes, the microbial mortality rate can reach 50% and 80%. Therefore, it is better to choose cloudy or early evening application.
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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