Ultra-low-volume spraying technique of oil solution of Beauveria bassiana and deltamethrin against Dendrolimus punctatus

The control efficiency of ultra low volume spraying technique of oil solution of B.bassiana and deltamethrin against Dendrolimus punctatus was studied.The mortality ranged from 28 1% to 94 4% as the dosages of B.bassiana +deltamethrin ranged from 1 500 mL+1 5 mL to 6 000 mL+12 mL per hm 2.The muscardine rate was correlated with the dosage of B.bassiana,and the rate ranged from 7 5% to 31 5%.The mixture of B.bassiana and deltamethrin was an effective and sustainable control measure against D.punctatus.