A cytoplasmic polyhedrosis virus (CPV) infecting Manduca sexta was characterized. The genome consisted often equimolar RNA segments ranging in estimated molecular mass from 0.7 to 3.84 Mdaltons and with a total estimated molecular mass of 21.75 Mdaltons. The sizes of the individual RNA segments provisionally placed this CPV within the type 8 classification of Payne and Rivers. The polyhedrin protein had an estimated molecular mass of 28 kdaltons. Six virion-associated proteins were observed, ranging in size from 27.1 to 160 kdaltons. The RNA and protein profiles were compared to profiles observed from two other CPVs infecting Orgyiapseudotsugata and Bombyx mori. In addition, the nucleic acid sequence homology, using 32P-labeled cDNA to the total M. sexta CPV genome, demonstrated no homology with the B. mori CPV or the O. pseudotsugata CPV. The M. sexta CPV was transmitted by per os inoculation to O. pseudotsugata larvae.

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