Abstract
A new insect virus was isolated from the English grain aphid Sitobion (Macrosiphum) avenae and the rose grain aphid Metopolophium dirhodum maintained in continuous laboratory culture. The virus particles were isometric with a diameter of 30 nm. The particles from S. avenae had a sedimentation coefficient of 156 S, had a buoyant density of 1.366 in CsCl, contained RNA, and had one capsid protein of M r 29,000. The virus was serologically unrelated to two similar viruses isolated from aphids— Rhopalosiphum padi virus and aphid lethal paralysis virus. It did not multiply in crop plants on which both S. avenae and M. dirhodum feed or in pupae of the honey bee, Apis mellifera, and was not detected in field-collected aphids. Virus could be transmitted to healthy aphids by contact with honeydew secreted by virus-infected individuals.
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