Comparison of short- and long-feed transmission of the cauliflower mosaic virus Cabb-S strain and S delta II hybrid by two species of aphid: Myzus persicae (Sulzer) and Brevicoryne brassicae (L.).

The cauliflower mosaic virus (CaMV) hybrid S delta II, partially deleted in ORFII, loses its transmissibility by the aphid Myzus persicae on 5-min acquisition feed. We have also shown that it is not transmitted after 8-h acquisition feed. The same occurs with Brevicoryne brassicae. Therefore, the aphid transmission factor (ATF) is involved in both means of transmission and in both aphid species. M. persicae can acquire CaMV Cabb-S strain in less than 20 s. M. persicae is a more efficient vector during a short feed than during a long feed, contrary to B. brassicae which transmits better during a long feed.