Our evidence suggests that the tip necrosis disease in passionfruit on the New South Wales North Coast results from infection of the commercial plants with CMV. These plants already contain a mild strain of PWV through the accreditation scheme. it is probable that the tip necrosis disease seen in the field and that produced experimentally resulted from a dual infection with CMV and PWV, because neither virus alone causes such a severe disease (8) and there was no indication of the presence of the tip blighting strain of PWV. Also, experimental inoculation of CMV to passionfruit seedlings infected with PWV produces a severe disease syndrome that includes tip necrosis (8).