Comparison on the Main Physiological Characteristics and Toxicity among the Southern Strain of Paecilomyces farinosus,Northern Strain of Pf and Beauveria bassiana

The results show that the germination percentage of conidiospores of southern strain of Paecilomyces farinosus(SSPf),northern strain of P.farinosus(NSPf)and Beauveria bassiana(Bb)is 79.8%,67.2% and 78.4% respectively in the water drop at 25℃;when the RH is below 90%,the germination percentage of conidiospores sharp declines;the optimum temperature for the conidial germination of Bb and Pf(both SSPf and NSPf)is 25℃ and 20℃,respectively;the conidial germination percentage of SSPf is higher than that of NSPf over 15℃,but the situation is on the contrary below 15℃;the conidial yield of both SSPf and NSPf is basically same on the PDA nutrient medium;the optimum growth and conidial production temperature of NSPf and SSPf is 20～25℃ and 20℃,respectively;and the infection rate of Bb on Dendrolimus punctatus is higher than that of Pf over 20℃,but obviously lower below 15℃.