Nuclear Polyhedroses of Several Insects

Nuclear polyhedroses of Malacosoma neustria testacea MOTSCHULSKY, Dasychira confusa BREMER, Ivela auripes BUTLER and Neodiprion sertifer GEOFFROY were described. Electron microscopic study was made on the nuclear-polyhedrosis virus of M. neustria testacea. Ultrathin sections of the infected tracheal epithelium and epidermis showed the presence, in the cell nuclei, of rod-shaped virus particles and polyhedra, within which virus particles were also present. The virus particles isolated from the polyhedra were, in most cases, found to be bundles consisting of two rods. In rare cases, however, the virus rods were found singly or as bundles of three rods. The rod was 300×50mμ in size.