Abstract
During the summer of 1955 an outbreak of the Far Eastern urticating moth, Euproctis flava Bremer, occurred in an extensive area of Japan. The urticating spicule, s of both the caterpillars and the moths cause itching for human skin, and frequently produce rashes and swellings even accompanied with fever.
During the course of our investigation the caterpillars were found to be attacked by polyhedrosis, of which the polyhedra were formed in the nuclei. At the same time small outbreaks of the tea-tussock moth, Euproctis pseudocons persa Strand have occurred, and, allied polyhedral disease of the larval insects was also recognized. This paper deals with the pathology and the viruses of the polyhedroses of these Lepidoptera.
