What precautions should be taken when using biopesticides?
In recent years, biopesticides have gradually replaced some chemical pesticides in our daily lives and are used in planting and production. Compared with chemical pesticides, biopesticides do not harm humans and livestock, and provide a better guarantee for the yield and quality of agricultural products. However, there are still many things to pay attention to when using biopesticides. So below, the editor brings you the precautions for using biopesticides. Let's take a look!
1. Pay attention to temperature
Temperature is something we need to pay special attention to when using biopesticides. This is because in most biopesticides, the active ingredients are mainly composed of protein crystals and spores. If the temperature is too low, the reproduction speed of spores in pests will drop significantly, and the effect of protein crystals will also be inhibited. Special surveys have also shown that if biopesticides are used at a temperature of about 28°C, their efficacy is about twice as high as at 15°C.
2. Pay attention to humidity
Besides temperature, humidity is also something we need to pay more attention to. The microorganisms in biopesticides generally like to grow in a relatively moist environment. Therefore, when using biopesticides, maintaining field humidity is very important. Especially when spraying powdered biopesticides, the field application should be appropriately increased. So when spraying biopesticides, it is best to do so in the morning and evening. This is because at these times there is dew in the field, which can ensure that the microbial agent sticks well to the crops, promote spore reproduction, and improve the pesticide effect.
3. Pay attention to light
The efficacy of biopesticides is also directly related to light. Ultraviolet rays in sunlight have a very strong killing effect on spores. If biopesticides are exposed to sunlight for half an hour, the mortality rate of the spores can reach nearly half. If they are exposed to direct sunlight for more than one hour, spore mortality can reach as high as 80%. In addition, if parasporal crystals are exposed to ultraviolet radiation, the pesticide effect will also be reduced. Therefore, we must be careful not to use biopesticides in sunlight, and this is also one of the main reasons why biopesticides should be used in the morning and evening.
4. Pay attention to rain
Although a moist environment is very beneficial to the efficacy of biopesticides, rainwater can cause the efficacy to decline. After we use biopesticides, if it rains, the rainwater will wash away the biological bacterial liquid attached to the crops, causing the biopesticides to lose their effect. Therefore, we should pay attention to observing the weather. If it rains after spraying, then it should be resprayed in time, and then rain protection work should be done well. However, if it rains more than five hours after spraying, then there is no need to worry, as this can even increase the pesticide effect.
The above is a brief introduction to the precautions for using biopesticides. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!