Barley yellow dwarf in Southern Africa
1990
Wechmar, M.B. von (University of Cape Town, Rondebosch (South Africa))
Barley yellow dwarf virus (BYDV) occurs in small grains in the Western Cape, a winter rainfall region, and in the Eastern Orange Free State in South Africa. The situation is confused by the presence of other viruses such as cucumber mosaic virus and brome mosaic virus. BYDV infection was found along with these viruses, but at low incidence. PAV-like and SGV-like BYDV isolates occur in this area. The main aphid species implicated in the transmission of BYDV in South Africa are Rhopalosiphum padi (L.), Diuraphis noxia (Mordvilko), Schizaphis graminum (Rondani), Sitobion avenae (Fabricius), and R. maidis (Fitch). BYD currently appears not to be an economically significant disease in South Africa. It has not been evaluated in other southern African countries mainly because of lack of trained staff.
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