A virus, code-named 52V, was obtained from 16 cultivars and seedlings of red raspberry (Rubus idaeus) in Scotland by inoculation of sap to Chenopodium quinoa during spring or autumn. Some raspberry plants became infected with 52V after six months in the field and more than 50% of the plants of some cultivars were infected after four years. The virus was also obtained from black raspberry (R. occidentalis) previously infected with virus from R. idaeus by means of aphids (Amphorophora rubi (Kalt.) and Aulacorthum solani (Kalt.)). These aphids transmitted 52V from R. idaeus to C. quinoa. Properties of the virus are described.