Abstract
One non-celery-infecting strain of aster yellows virus (NAYV) and two celery-infecting strains (CAYV-Z and CAYV) were isolated in Manitoba. Percentage transmission of the three strains of AYV to 13 plant species by single, infective male or female six-spotted leafhoppers (Macrosteles fascifrons (Stål)) given a 2-day inoculation feed varied with the host and virus strain. Head lettuce (Lactuca sativa var. capitata L.), and stinkweed (Thlaspi arvense L.) were superior to China aster (Callistephus chinensis Nees) as indicators of the proportion of infective leafhoppers. Acquisition of virus by vectors fed on the 13 plant species, as indicated by transmission to aster, differed according to strain and host. The differences between hosts in the percentages of plants infected with AYV was attributed to plant host – virus rather than the vector–virus relationships.There was no correlation between the susceptibility of a host and its value as a virus source. Head lettuce was the only one of the 13 plant species tested that was highly susceptible and from which all three strains of AYV could be readily acquired.
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