Avm is the new type of anti-acarid antibiotic,which is distilled after microbial ferment,B1a is the most active content of it and has a very good effect on anti-acarid and other pests, so it has the feature of "broad-spectrum,high efficient,low hangover and easy use".So it is the ideal biological agricultural chemical to current anti-pest.Avm to kill pest through eat(mastication insects and stick & suck insects) and touch(avm can enter into body through insects' stoma and claw), it blocks the nerval conduct system of insects to paralysis and dyed,avm can be decomposed by light and microbe,and can be absorbed into the body of plant by its roots,so it is safe to the environment.