Association of cocksfoot mild mosaic and cocksfoot streak viruses in Dactylis glomerata and their simultaneous transmission by aphids

Macrosiphum (Sitobion) fragariae transmitted cocksfoot mild mosaic and cocksfoot streak viruses two to three times more frequently from plants in which they occurred together than from plants in which they occurred alone. In cells of doubly infected plants, particles of the two viruses commonly occurred in close association.