Abstract
No significant differences in the virus transmission rate were found when virus acquisition feedings by the aphids were in the 11- to 45-second range, but there was a marked reduction when acquisition feedings were extended to 51 to 60 seconds. The transmission rate was higher if aphids were starved for 5 minutes or more before they fed on diseased plants. The maximum effects of preliminary starvation were obtained in 10 to 15 minutes, and no further changes in transmission rates were observed with starvation periods up to 4 hours. The differences in transmission rates between starved and unstarved aphids could not be explained by differences in acquisition feedings. Failure of some aphids to transmit the virus, while others did that had the same period of preliminary starvation, was not due to differences in the duration of acquisition feedings. Nor could large interreplicate or interexperiment variations in transmission be explained by variations in aphid behavior.
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