APPLICATION OF METARHIZIUM ANISOPLIAE TO CONTROL THE FIRST GENERATION OF DENDROLIMUS PUNCTATUS

Metarhizium anisopliae and Beauveria bassiana were used to control Dendrolimus punctatus in laboratory.The data was showed that there was small difference in toxicity to 2nd～3rd instar larvae of D. punctatus between M. anisopliae and B. bassiana at 25 ℃ in the laboratory.The n (LC 50 ) of M. anisopliae was 1.06×10 7 L -1 and the t (LT 50 ) was 7.95～ 12.04 d ( n (spore) = 1.0×10 11 ～ 1.0×10 7 L -1 ).The n (LC 50 ) of B. bassiana was 1.37×10 6 L -1 and the t (LT 50 ) was 7.48 ～ 11.27 d ( n (spore) = 1.0×10 11 ～ 1.0×10 7 L -1 ).The strain of M. anisopliae was more tolerant to high temperature and drought than B. bassiana .At high temperature or low humidit y,the pathogenicity of M. anisopliae on D. punctatus was superior to that by B. bassiana .The test indicated that M. anisopliae was greatly superior in controlling first generation of D. punctatus to B. bassiana ,and had greater value in controlling D. punctatus probably. Tab 8, Ref 14