质型多角体病毒（ＣｙｔｏｐｌａｓｍｉｃｐｏｌｙｈｅｄｒｏｓｉｓＶｉｒｕｓ，简称ＣＰＶ）感染赤松毛虫幼虫后，幼虫死亡率随感染龄期的增大而减小，随处理剂量的增加而增大；老熟幼虫感病后死亡率低，但幼虫化蛹死亡率高达５３３％．羽化率仅为２５１％～２７５％，成虫产卵量比未带毒成虫产卵量减少４０９％，部分成虫甚至不产卵，卵孵化率较对照低１０～２０个百分点，且子代幼虫带毒率高达６１１％，死亡率达４９８％．ＣＰＶ与Ｂｔ混用，可迅速降低幼虫的取食量，处理后第５天幼虫的排粪量约为单用ＣＰＶ的１／２～２／３，ＬＴ５０值最大差３６ｄ，ＬＴ９０值最大差６９ｄ． After infected with Cytocoplasma polyhedrosis virus (CPV) larvae, larval mortality decreased with increasing infection age and increased with the increase of treatment dose. The mortality rate of mature larvae was low, However, larval pupation mortality as high as 53  3%. The emergence rate was only 251% ~ 275%. The fecundity of adult adults was 409% less than that of unproductive adults. Some adults did not even lay eggs, and the hatching rate of eggs was 10 ~ 20 percentage points lower than that of the control , And offspring larvae with the highest rate of 61  1%, the mortality rate of 49  8%. CPV mixed with Bt could rapidly reduce the larval feeding amount. The larval excretion of larvae on the fifth day after treatment was about 1/2 to 2/3 of the single CPV, the maximum difference of LT50 was 3.6 days, and the maximum difference of LT90 69d.