Abstract: A survey of pathogens of Monochamus alterna tus, a vector o fB ursaphelenchus xy loph ilus, w as con-ducted at Forest Fa rm of Maanshan, Anhu i Prov ince. E igh t entomogenous fung i and one bacterium w ere ident ified from M onochamu s alterna tu s in pine forests. O f these species, B eauveria bassiana w as the m ost commonspec ies. There w as substant ia l variab ility in v iru lence among the stra ins of the sam e spec iesB. bassian and thedifferent species. The stra ins o fB. bassiana w ere tested on v iru lence toM. alternatu s, co lony g row th and sporogenous ability. These resu lts suggested stra in 226 m ight be a effect ive agent for con tro ling o fM. alterna tus.