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分别用５种浓度的八字地老虎核型多角体病毒（Ｘｃ－ｎＮＰＶ）悬液接种２龄八字地老虎幼虫和２龄甘蓝夜蛾幼虫。结果表示，两者的ＬＧ_（５０）和 ＬＴ_（５０）相差不大，可见Ｘｃ－ｎＮＰＶ对两者的毒力和潜伏期相当。用感染Ｘｃ－ｎＮＰＶ后致死的甘蓝夜蛾幼虫体内分离的病毒回接２龄八字地老虎幼虫，发现这一病毒对八字地老虎幼虫的毒力不高。
The 2nd instar larvae of Tigers larvae and the second instar larvae of cabbage larvae were inoculated with five concentrations of Xc-nNPV. The results showed that there was no significant difference between LG 50 and LT 50, indicating that Xc-nNPV had similar virulence and latency to both. The virus isolated from the larvae of B. campestris which died after infection with Xc-nNPV was used to recycle the larvae of the second instar eight-footed tiger, and found that the virus was not virulent to the larvae of the eight-spotted tiger.