Abstract

Insect viruses with inclusion bodies have been traditionally assigned to three “genera” according to the site of production and the morphology of the inclusion bodies and virus particles. These genera correspond to the nuclear polyhedroses, the cytoplasmic polyhedroses and the granuloses. Comparison of the viral nucleic acids does not support separation of the granuloses from the nuclear polyhedroses. Numerical analysis of data on the serological cross-reactions and amino acid composition of the viral proteins supports classification according to base composition of the nucleic acids. It is suggested that the granuloses and nuclear polyhedroses form a single complex of genetically related viruses, the subgroups of which do not correspond to the conventional “genera.” The cytoplasmic polyhedroses are completely unrelated to the nuclear polyhedroses and granuloses.

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