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The Pathogenicity Research of Beauveria Bassiana to Holcocerus hippophaecolus Larvae

Wang Xiang,Xu Zhichun,Liu Hongxia(1.The Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University,100083,P.R.China.)  
The pathogenicity of Beauveria bassiana to Holcocerus hippophaecolus larvae under different temperatures,humidities and dosages was studied in the laboratory.The young,medium and old-instar larvae of the seabuckthorn carpenter(Holcocerus hippophaecolus) were infected with different concentrations of B.bassiana under 10,15,20,25 and 30℃ conditions.The results showed that under 25℃,RH90%,concentration(1×10~8conidia per ml),the larvae died most quickly and the mortalities were the highest.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 seabuckthorn carpenter under different humidities.The larvae died most quickly and the mortality was the highest under 90% relative humidity,while the mortality decreased drastically under 70% relative humidity.
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