Abstract
Field observations of an epizootic in gypsy moth (Lymantria dispar japonica MOTSCHULSKY) population by two pathogenic fungi during the summer of 1972 in a larch forest in Tohoku District of Japan indicated that fungus-killed larvae occurred in about 99% of the population. Mixed infection of Paecilomyces canadensis (VUILL.) BROWN et SMITH and Entomophthora aulicae (REICH.) SOROK. occurred in about 20% of the dead larvae, which showed typical muscardine. Only E. aulicae was found in the remaining fungus-killed larvae. Most of the dead larvae were found near the base of the tree trunks.
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