Evidence that a component other than virus particle is needed for aphid transmission of potato virus Y

Aphids (Myzus persicae Sulz) did not transmit potato virus Y after probing into purified virus preparations, but did if these preparations were first mixed with extracts of infected plants from which all potato virus Y particles had been removed by centrifuging. The same centrifuged extracts also ‘helped’ aphid transmission of potato aucuba mosaic virus.