Detailed Explanation of Key Points for Using Bacterial Biological Insecticides
Bacterial biological insecticides have advantages such as high insecticidal rate, no environmental pollution, safety to natural enemies, harmlessness to humans and livestock, and not inducing pest resistance. They are a new type of protective pesticide currently promoted for use in pollution-free cultivation. Because their control effect mainly depends on the bacterial activity in the pesticide, the following points need to be kept in mind during use...
Bacterial biological insecticides have advantages such as high insecticidal rate, no environmental pollution, safety to natural enemies, harmlessness to humans and livestock, and not inducing pest resistance. They are a new type of protective pesticide currently promoted for use in pollution-free cultivation. Because their control effect mainly depends on the bacterial activity in the pesticide, the following points need to be kept in mind during use:
1. Avoid using inferior pesticides. Purchase from legitimate manufacturers and pesticide sales outlets to prevent counterfeits and inferior products, and pay attention to the production date, service life, and proper storage of the pesticide to prevent expiration and loss of effectiveness. In addition, normal pesticide products generally contain a certain amount of bacteria; when the lid is opened there should be no foul odor, and sometimes there may be a fragrant smell (given off by the culture medium), while expired or fake products often produce an unusual odor or have no smell.
2. Avoid using 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 pest body, and the protein crystals are not easy to take effect. The ambient temperature is generally suitable at 10-35 degrees C. If it is too low, it will affect the insect's feeding amount, and the control effect will be somewhat poorer.
3. Avoid dry environments. The bacterial spores in bacterial biological insecticides prefer humid environments, so the greater the field humidity during use, the higher the efficacy; especially when spraying powdered biological pesticide formulations, more attention should be paid to field humidity. Generally, bacterial powder formulations are sprayed in the early morning and evening when there is dew.
4. Avoid strong light. Ultraviolet light in sunlight has a killing effect on spores. If the light is strong, ultraviolet rays will kill the bacteria. Therefore, bacterial biological insecticides should be sprayed on cloudy days or in areas with weak light. Generally, application is carried out before 10 a.m. on sunny days or in the evening.
5. Avoid washing by heavy rain. If moderate to heavy rain occurs shortly after spraying bacterial biological insecticides, it will wash away the bacterial liquid sprayed on crop stems and leaves and reduce the efficacy. However, if light rain falls 5 hours after application, it will not only fail to reduce the control effect, but will instead have a synergistic effect.
6. Avoid mixing with fungicides. When applying bacterial biological insecticides, never mix them with fungicides
(such as carbendazim, thiophanate, etc.), otherwise it is easy to cause 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 insecticide.