A study on the resisitance of different Beauveria bassiana strains

In order to screen high resistance Beauveria bassiana strains,a comprehensive study and comparison were conducted in the aspects of drought resistance,uvioresistant ability,high and low temperature resistant ability with 7 strains selected from soil.Research revealed that,in drought resistance,GT50 of the strains B4-001 and B7-095 were 7.06 and 5.60 respectively.When the PEG content was 40%,they got higher germination rate of 47.62% and 51.4% respectively,and the LT50 of uvioresistant ability were 1.67 and 0.77,respectively.When irradiated for 15min,the mortality rate of B4-001 was 99.05%,and B7-095 was 99.72%,both of them were lower than that of the other strains.As to the anti-high/low-temperature ability,the mortality of B4-001 spores was 97.93%,lower than that of the other strains.Under the condition of low temperature 15℃,the germination rate of B4-001 was high and grew fast.Comparison showed that strains B7-095 and B4-001 were best in the aspects of above resistances,and the strains B7-095 and B4-001 may have great development and application values in the application of the entomogenous fungi production,and the study may provide a reference for the formulation of strategies for pest control.