Abstract

Raspberry plants were freed from infection by some aphid-borne viruses by exposure for 2-3 weeks at temperatures around 35 C. More cures were effected with Norfolk Giant and Malling Jewel than with Lloyd George and Malling Promise, and the results suggest that aphid-borne raspberry viruses differ in ability to multiply in plants at high temperature. The methods used to propagate virus-free plants and are described.