Key points for attention in the use of bacterial biological insecticides

Bacterial biological pesticides have the advantages of high insecticidal rate, no pollution to the environment, safety to natural enemies, harmless to humans and animals, and no resistance to pests. They are new protective pesticides that are currently promoted for pollution-free cultivation. Because their control effect mainly depends on the bacterial activity in the pesticide, attention should be paid to the following points when using them: First, avoid using inferior pesticides. It should be purchased from regular manufacturers and pharmaceutical sales points to prevent counterfeiting, and pay attention to the production date and service life of the medicament and the reasonable storage of the medicament to prevent expiration. In addition, normal pharmaceutical products generally have a certain amount of bacteria, there should be no odor when opening the lid, and sometimes there will be fragrance (emitted by the culture medium), while expired or fake products often produce odor or no odor. Second, avoid low temperature use. The active ingredients of bacterial biopesticides are protein crystals and viable spores. Under low temperature conditions, bud spores reproduce slowly in pests, and protein crystals are not easy to act. The ambient temperature is generally suitable at 10~35℃, if it is too low, it will affect the insect appetite, and the control effect is poor. Third, avoid dry environment. Bacterial biopesticides in the bud embrace like wet environment, so the greater the humidity in the field, the higher the efficacy, especially when spraying powdery biopesticides should pay attention to the field humidity. Generally in the morning and evening when there is dew spraying powder bacteria. Fourth, avoid strong light. The ultraviolet rays in the sun have a killing effect on the buds, and if the light is strong, ultraviolet rays will kill the bacteria. Therefore, spraying bacterial biological pesticides should be carried out in cloudy days or in weak light. Application is generally carried out before 10 a.m. or evening on sunny days. Fifth, avoid heavy rain shower. Shortly after spraying bacterial biopesticides, moderate to heavy rain will wash away the bacterial solution sprayed on the stems and leaves of crops and reduce their efficacy. But if it drizzled 5 hours after application, it would not reduce the control effect, but had synergistic effect. VI. Avoid mixing with fungicides. When applying bacterial biopesticides, do not mix them with fungicides (such as carbendazim, thiophanate, etc.), otherwise it will easily lead to a serious reduction in the number of bacteria in the pesticide, thus affecting the insecticidal effect. Therefore, even the spray that has been sprayed with fungicide must be rinsed before it can be assembled with bacterial biological pesticides.