Factors Affected Conidia Germination of Paecilomyces cicadae

Effects of different nutrition,temperature,moisture,light,and pH were studied on conidia germination of Paecilomyces cicadae LB.The results showed that the nutrition(2% glucose + 1% peptone)strongly promoted conidia germination,and reached the highest germination rate 95.09%.The optimum temperature for the germination of the spore was 25～27℃.The relative humidity for germination was between 90%~100%,while less than 90% spore could not germinate.The suitable pH was 6～7 for spore germination.There was no effect from light for spore germination.UV obviously had killing effects on spore,the germination rate of spore decreased evidently along with the longer exposure time,spore had retarded germination when treated by UV,with germination rate 78.10% in 24 hours treated 20 min,52.73% for 40 min,and 23.36% for 60 min.