Silkworm bacteriosis have occurred in the sericulture production, bring the sericultural production serious harm. In this Paper, based on the in vitro bacteriostasis experiment, sceening a preferable drug-Levofloxacin to restrain Bacillus thuringiensis, Bacillus bombysepticus, Serratia marcescena Bizio from five kinds of commonly used veterinary antibiotics Levofloxacin, Enrofloxacin hydrochloride, Deoxytetracycline, Neomycin Sulphate and Florfenicol. The paper studiedthe control efficiency and the influenc...