Median Lethal Concentrations and Times of Beauveria bassiana (Bals.) Vuill. and Metarhizium Anisopliae (Metsch.) Sorokin Against the Third Instar Larvae of Spodoptera litura (Fab.)

摘要

The median lethal concentrations (LC_(50)) and times (LC_(50)) of Beauveria bassiana (Bals.) Vuill. and Metarhizium anisopliae (Metsch.) Sorokin were determined against the third instar larvae of Spodoptera litura (Fab.) by dipping the larvae in fungal spore suspension concentrations varying from 25 to 125x10~4 spores/ml and 100 to 300x10~4 spores/ml, respectively. The LC_(50), recorded with B.bassiana and M. anisopliae against the third instar larvae of S.litura were 20.4x10~4 and 9.4x10~4 spores/ml, and 265.2 x 10~4 and 98.9 x 10~4 spores/ml at nine and eleven days after treatment, respectively. Whereas, the LT_(50) values were ranged from 180.0 to 302.4 hours in case of B. bassiana and 196.8 to 256.8 hours in case of M. anisopliae.