Metarhizium anisopliae,an important entomopathogenic fungus,is used for biological control.Two groups,2.5% of M.anisopliae complex preparation agent(cl-Bioc)and 4.5% of Cypermethrin,were designed to test the control efficiency on grassland locust.And each group included 3 concentration levels(450 mL/hm2,600 mL/hm2,750 mL/hm2).The results indicated that the M.anisopliae agent showed excellent control efficiency at 3 concentration level.The control efficiency of 4.5% Cypermethrin at 450 mL/hm2 of concentratio...