Abstract
Transmission of a celery-infecting isolate of aster yellows virus was an exponential function of both acquisition and inoculation periods when six-spotted leafhoppers, Macrosteles fascifrons (Stål.), were permitted test feeding times arranged in geometric progression from 0.125 to 32 hours. In the single acquisition test conducted, no transmission occurred with feeding periods of less than 2 hours; however, transmission occurred over the entire range of inoculation times tested. Per cent transmissions from a 32-hour acquisition time, or similar inoculation time, were 77.7% and 73.7% respectively.
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