Laboratory assessment was conducted to determine the virulence of Isaria fumosorosea Ifu13 a against mult iple sucking insect species that are serious pest of crops and ornamental plants.Pathogenicity of I.fumosorosea against the insect species,Stephanitis nashi(Hemiptera:Tingidae),Jacobiasca formosana(Hemiptera:Cicadellidae),Trialeurodes vaporariorum(Hemiptera:Aleyrodidae) were determined by exposing them to conidia suspension of I.fumosorosea at 1.0×10~8,1.0×10~7,1.0×10~6,and 1.0×10~5 conidia/mL.The strai...