METHOD: Both ELISA and Visual Examination CONDITIONS: Green House - 16h light with daily mininum temp 19C and maximum 26C. METHOD NARR: CMV-infected tobacco plants were used for side-graft inoculation of 4 plants of each genotypeved up to 6 weeks and virus titres were measured by ELISA at 4 and 6 weeks after inoculation. RESULTS NARR: Fny-CMV did not cause symptoms, A9-CMV caused mosaic, and LS-CMV caused stunting and narrow, wavy leaflets, and thrated increasing virus titres in palnts. AUTHOR EXPLANATION: Mosaic symptoms were attenuated to some extent with sunny weather and rising maximum temperatures. Systemic necrosis continued to develop during the warmer growin