In biological insecticide, B. t and Avermectin have been widely used.This paper introduced the two kinds of insecticide and provided the problems should be paid attention to in right application.

• 在生物农药中，B.；t和阿维菌素己广泛应用，介绍了这两种农药的性能，并指出正确使用中应注意的问题。