2017 ASHS Annual Conference

The raspberry aphid, Amphorophora agathonica Hottes, is widespread across much of North America and is believed to be the primary vector of for viruses in the Raspberry mosaic virus complex, causing field decline and leading to crumbly fruit symptoms in red raspberry (Rubus idaeus L.). Breeding for aphid resistance has been one of the major goals of BC's raspberry breeding program since the early 1960s. There are now seven confirmed biotypes in major raspberry production region of SW British Columbia and NW Washington, distinguished by their ability or inability to colonize a differential set of raspberry cultivars. Here we present information on potential new sources of resistance for breeding, as well as segregation data helping to clarify the inheritance of the resistance genes which had been previously considered to be dominant and complementary Ag₂ and Ag₃.