粉拟青霉南北株系和白僵菌主要生理特性及毒力的比较

在 2 5℃条件下 ,粉拟青霉 (Paecilomycesfarinosus)南北株系和白僵菌 (Beauveiabassiana)在水滴中的孢子萌发率分别为 79 8%、6 7 2 %和 78 4%。而当RH为 90 %以下时 ,孢子萌发率急剧下降 ,白僵菌分生孢子萌发最适温度为 2 5℃ ,粉拟青霉均为 2 0℃ ;15℃以上时 ,S -Pf菌株萌发率高于N -Pf菌株 ,15℃以下相反。在PDA培养基上 ,粉拟青霉南北株系产孢量基本相同 ;N -Pf最适生长温度 ;产孢温度为 2 0～ 2 5℃ ;S -Pf则为 2 0℃ ;在 2 0℃以上 ,Bb对马尾松毛虫的感染率高于粉拟青霉 ,但在 15℃以下 ,粉拟青霉则明显高于白僵菌。

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℃.