|Gildow, Fred - PENN STATE UNIV|
|Levy, Laurene - USDA-ARS-PPQ-NPGQC|
Submitted to: Acta Horticulture Proceedings
Publication Type: Proceedings
Publication Acceptance Date: September 1, 2004
Publication Date: September 1, 2004
Citation: Gildow, F.E., Damsteegt, V.D., Stone, A.L., Schneider, W.L., Luster, D.G., Levy, L. 2004. Transmission of two north american isolates of plum pox virus: identification of aphid vectors and species-specific transmission from infected stone fruits. Acta Horticulture 657:207-212 Technical Abstract: North American populations of 13 aphid species were tested for their ability to transmit isolates of plum pox potyvirus recovered from infected trees in Adams and Franklin Counties, PA. Six species, Aphis fabae, A. spiraecola, Brachycaudus persicae, Myzus persicae, Rhopalosiphum padi and Toxoptera citricida transmitted PPV in unrestricted probing tests utilizing Colmo pea as both the PPV source and transmission bioassay indicator. A. spiraecola and M. persicae were the most efficient vectors with 86% and 83% of 100 seedlings infected when infested with 25-50 aphids each. R. padi only occasionally transmitted PPV to pea (2%). Although an effective vector, T. citicida (36% in pea) does not occur in major stone fruit growing areas and is restricted to Florida. In transmission tests using observed 30 second probes and one aphid per pea seedling, two populations of M. persicae (PA and AZ) transmitted at 10% and 13% efficiency. When given an acquisition period on PPV-infected peach seedlings and then allowed an unrestricted inoculation period on healthy peach seedlings, M. persicae, A. spiraecola, A. fabae, and B. persicae transmitted PPV to 63%, 31%, 38%, and 32% of the seedlings, respectively. When acquisition fed on infected peach fruit and allowed an unrestricted probing period on peach seedlings, the same aphid species transmitted PPV to 50%, 35%, 0%, and 0% of seedlings, respectively, in replicated tests. Pennsylvania isolates of PPV were transmitted effectively by indigenous aphid populations, were acquired and transmitted from fruit collected from infected orchard trees over two growing seasons, and had different degrees of transmission efficiency when acquired from foliar or fruit tissues.