Abstract
Infection with an M-type (particle producing) isolate of tobacco rattle virus (TRV) was detected in leaves and/or roots of some plants from 11 of 13 potato cultivars grown in soil containing viruliferous trichodorid nematodes. Virus was detected in tubers of 8 of 13 cultivars, although only two (Pentland Dell and Maris Bard) developed spraing symptoms. Six cultivars (Arran Consul, Home Guard, King Edward, Romano, Sante and Wilja) were infected with TRV without developing spraing symptoms. Plants grown from virus-containing, symptomless tubers became systemically infected with M-type TRV and produced symptomless infected daughter tubers. Virus was maintained through three generations of vegetative propagation, and the plants were sources for acquisition of the virus by trichodorid nematodes. Distribution of virus in both spraing-affected and symptomless tubers was erratic. Movement of symptomlessly infected seed tubers may be a means of dissemination of the virus and of its introduction to previously unaffected sites.
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