2001•Acta Entomologica SinicaRequires access
The pathogenicity of Beauveria bassiana to Helicoverpa armigera under different temperatures and humidities
Yuyuan Guo
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Abstract
The pathogenicity of Beauveria bassiana to Helicoverpa armigera under different temperatures and humidities was studied in the laboratory. The 1～4-instar larvae of the cotton bollworm were infected with different concentrations of B.bassiana under 10, 15, 20, 25 and 30℃ conditions. The results showed that under 25℃, the LT 50 s of the larvae treated with three different concentrations of B.bassiana were the shortest, the larvae died most quickly and the mortalities were the highest. The LT 50 s were prolonged as the ambient temperature turned higher or lower than 25℃,and the larvae died slowly under these temperatures. There were significant differences among the mortalities of the cotton bollworm under different humidities. The larvae died most quickly and the mortality was the highest under 95% relative humidity, while the mortality decreased drastically under 70% relative humidity.