What are the precautions for using bacterial biological insecticides?
Precautions for using bacterial biological insecticides
(Agricultural Wealth Network) 1. Do not use at low temperatures. The active ingredients of bacterial biological insecticides are protein crystals and living spores. Under low-temperature conditions, the spores reproduce slowly in the pests' bodies, and the protein crystals are also less likely to take effect.
2. Do not use in dry environments. The spores of the bacteria in bacterial biological insecticides prefer humid environments, so the higher the field humidity when applying them, the higher the efficacy; this is especially important when spraying powdered biological pesticide formulations. Generally, spray the bacterial powder formulations in the early morning and at dusk when there is dew, so that the bacterial preparation can better adhere to the crop stems and leaves, promote spore reproduction, and improve efficacy. Spraying on foggy mornings or watering the vegetables half an hour before spraying gives better results.
3. Do not use inferior pesticides. To ensure the quality of the pesticide used, buy from regular manufacturers and pesticide sales outlets to prevent counterfeits and inferior products, and pay attention to the pesticide's production date, service life, and proper storage to prevent expiration and loss of effectiveness.
4. Do not expose to strong light. The ultraviolet rays in sunlight have a killing effect on spores; if the light is strong, ultraviolet rays will kill the bacteria. According to tests, with half an hour of direct sunlight, the spore mortality rate reaches about 50%; with 1 hour of direct sunlight, the spore mortality rate reaches 80%. In addition, ultraviolet radiation can deform the parasporal crystals and reduce their effectiveness. Therefore, bacterial biological insecticides should be sprayed on cloudy days or in vegetable plots with weak light. Generally, apply the pesticide before 10 a.m. on sunny days or in the evening.
5. Do not let heavy rain wash it off. If moderate to heavy rain occurs shortly after spraying bacterial biological insecticides, it will wash the bacterial liquid off the crop stems and leaves and reduce efficacy. However, if light rain falls 5 hours after application, it will not reduce the control effect but instead have a synergistic effect, because this helps the bacterial spores reproduce rapidly inside and outside the pests' bodies.
6. Do not mix with fungicides. When applying bacterial biological insecticides, never mix them with fungicides (such as carbendazim, thiophanate-methyl, etc.), otherwise it can easily lead to a serious reduction in the number of bacteria in the pesticide, thereby affecting the insecticidal effect. Therefore, even a sprayer that has been used for fungicides must be rinsed clean before being filled with bacterial biological insecticides.
2. Do not use in dry environments. The spores of the bacteria in bacterial biological insecticides prefer humid environments, so the higher the field humidity when applying them, the higher the efficacy; this is especially important when spraying powdered biological pesticide formulations. Generally, spray the bacterial powder formulations in the early morning and at dusk when there is dew, so that the bacterial preparation can better adhere to the crop stems and leaves, promote spore reproduction, and improve efficacy. Spraying on foggy mornings or watering the vegetables half an hour before spraying gives better results.
3. Do not use inferior pesticides. To ensure the quality of the pesticide used, buy from regular manufacturers and pesticide sales outlets to prevent counterfeits and inferior products, and pay attention to the pesticide's production date, service life, and proper storage to prevent expiration and loss of effectiveness.
4. Do not expose to strong light. The ultraviolet rays in sunlight have a killing effect on spores; if the light is strong, ultraviolet rays will kill the bacteria. According to tests, with half an hour of direct sunlight, the spore mortality rate reaches about 50%; with 1 hour of direct sunlight, the spore mortality rate reaches 80%. In addition, ultraviolet radiation can deform the parasporal crystals and reduce their effectiveness. Therefore, bacterial biological insecticides should be sprayed on cloudy days or in vegetable plots with weak light. Generally, apply the pesticide before 10 a.m. on sunny days or in the evening.
5. Do not let heavy rain wash it off. If moderate to heavy rain occurs shortly after spraying bacterial biological insecticides, it will wash the bacterial liquid off the crop stems and leaves and reduce efficacy. However, if light rain falls 5 hours after application, it will not reduce the control effect but instead have a synergistic effect, because this helps the bacterial spores reproduce rapidly inside and outside the pests' bodies.
6. Do not mix with fungicides. When applying bacterial biological insecticides, never mix them with fungicides (such as carbendazim, thiophanate-methyl, etc.), otherwise it can easily lead to a serious reduction in the number of bacteria in the pesticide, thereby affecting the insecticidal effect. Therefore, even a sprayer that has been used for fungicides must be rinsed clean before being filled with bacterial biological insecticides.