METHOD: ELISA CONDITIONS: Green House - 16h light with mean day/night temp. 26C/16C and light intensity of 14-22Klux METHOD NARR: Etuberosa group frn was graft-inoculated with many viruses. The plants were tested using ELISA, NAting to a susceptible control. Uninoculated plants were also tested to provide background readings. ELISA absorbances are given. RESULTS NARR: Back-grafting to a susceptible control sometimes resuted in positive ELISA reested indicating transfer of the virus from a resistant accession.