Control effect of Metarhizium anisopliae complex preparation agent on grassland locust

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 concentration was not significantly different from that of M.anisopliae agent,so the latter could be used while the locust density was lower.The control efficiency of 4.5% Cypermethrin at 600 mL/hm2 of concentration was not significantly different from that of M.anisopliae agent at 750 mL/hm2 of concentration,so the latter could be used while the locust density was higher.