1984年8月在本所林地采集的马尾松毛虫(Dendrolimus punctatus)死幼虫,曼微镜检查发现有四角形多角垂体病毒。在室内用养虫盅养虫,用四角形多角体悬浮液喷布在松针上,供幼虫取食。幼虫感毒后,初期食欲不振,活动迟缓;后期虫体萎缩,刚毛竖起。喷病毒后到第七天幼虫开 In August 1984, Dendrolimus punctatus dead larvae collected from the native forest were found to have a quadrangular polyglot pituitary virus by microscopic examination. Insect support in the room with the host insect, with a rectangular polyhedron suspension sprayed on pine needles for feeding larvae. After the larvae infected with the virus, the initial loss of appetite, slow activity; late worm body shrinks, bristles erected. After the virus is sprayed, the larvae open on the seventh day