The properties and mode of transmission of strawberry latent ringspot virus (SLRV) are described. Natural infections have been found, in several widely separated localities, on cultivated and wild rosaceous species - strawberry, raspberry, cherry, plum, black currant - and on elder (Caprifoliaceae), but so far no diseases in these plants have definitely been associated with SLRV. Similarly, SLRV was transmitted mechanically to a wide range of hosts, many of which it infected symptomlessly. SLRV is transmitted by Xiphinema diversicaudatum (Micoletsky), has polyhedral-shaped particles of about 26 mu diameter, and has other features that suggest it should be classified along with a group of other similar soil-borne viruses.