Precautions for applying bacterial pesticides

Bacterial pesticides are biological preparations. The insecticidal effect is related to the quantity and activity of bacteria. When used, the meteorological conditions are strict. The following items must be taken into account when using.

First, the temperature: suitable temperature is above 20 °C. If the temperature is low, the active spores of the bacterial pesticides will slow down in the pests, and the active protein will not easily function. According to the test, the application is carried out at 25-30 ° C, and the drug efficacy is 1-2 times higher than that at 12-15 ° C. .

Second, humidity: the greater the environmental humidity, the higher the efficacy, especially the application of powdery bacterial pesticides. The main reason is that the spores of bacteria are not resistant to drying. Therefore, the application of powdery bacterial pesticides should be carried out in the morning and evening when there is dew, so that the bacteria can adhere well to the stems and leaves of the crops, and promote the spore propagation and increase the chance of contact with the pests.

3. Sunlight: The ultraviolet rays in the sun have a killing effect on spores. When the sunlight is directly irradiated for 30 minutes, the spores will die 50%, and the irradiation will be as high as 80%. In addition, ultraviolet radiation also has a deformation-reducing effect on the parasporal crystals. Therefore, it is advisable to apply the medicine after 4 pm or on cloudy days.

Fourth, rain: heavy rain will reduce the efficacy after application, but drizzle 5 hours after application, not only will not reduce the efficacy, but have the effect of increasing the efficacy. The drizzle promotes spore activity, which accelerates the death of pests. Therefore, the application of bacterial pesticides should be combined with local weather forecasts to ensure that there is no moderate or heavy rain within 1-2 days after application. In case of heavy rain after application, it should be replenished immediately after the rain; at this time, the insecticidal effect is better.
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