At present, biopesticides formulated with Bt insecticides and other biological agents have a broader insecticidal spectrum and are widely welcomed by the public. However, Bt insecticide must pay attention to the following points when using it:
1. In the field application, to ensure the quality of pesticides, it is necessary to meet the temperature conditions for the rapid growth of Bt bacteria. The higher the temperature, the stronger the pathogenicity. To avoid strong sunlight, because ultraviolet rays will cause damage to Bt bacteria, it is best to apply after 4 pm.
2. Pay attention to the living habits and sensitivities of target pests, host crops and environmental conditions, and application of synergists. For example, the prevention and control of borer pests should be performed 2 or 3 times during the hatching period of eggs, especially for aphids, with good control effect. Once the locust infested into the stem, the control effect was poor. To prevent and treat corn borer, it is necessary to strictly control the use of drugs at the end of the corn heart leaf stage in order to receive good results. Prevention and treatment of cotton bollworm, should be controlled in the 2 to 3 days after the peak of ovulation application, the effect is significant. The masses have the prevention and treatment experience of "controlling insects and not seeing insects, playing eggs without fighting insects". In this way, when the larvae hatch, they kill the insecticide by biting the eggshell and quickly die of poisoning. The residual period of Bt insecticide can generally reach 7-10 days. If rainfall occurs after application, the rain will wash away the liquid and it should be re-sprayed.
3, spraying methods can be sprayed, dusting, irrigation, spraying and other aircraft. Either way, be sure to apply the pesticide evenly to ensure that pests have a chance to eat before they can play a poisonous role.
4, Bt insecticide added a small amount of chemical pesticides, or mixed with other microbial pesticide application, can play a cooperative battle effect, can significantly increase the mortality of pests.
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