Transmission of Beet Yellows and Beet Mosaic Viruses by Noncolonizing Aphid Vectors

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Abstract
A late Rhopalosiphum padi (L.), Acyrthosiphon kondoi Shinji, and Diuraphis no:xia (Mordvilko) transmitted beet yellows virus (BYV) and beet mosaic virus (BMV) in laboratory tests. In single probe acquisition tests, A. kondoi! and D. no:xia failed to transmit BMV, but both transmitted the virus successfully in free-choice arena tests. A. kondoi and D. no:xia are new vectors of beet yellows and beet mosaic virus. None of the three aphids colonize sugar beets but may be important in BYV and BMV epidemiology.