Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: August 9, 1997
Publication Date: N/A
Barley yellow dwarf viruses have been responsible for major disease epidemics in cereals grown in the Southeast for several decades but there is limited information on the predominant virus isolates or their principle aphid vectors. Surveys of the major wheat growing regions of SC indicated that while PAV serotypes predominate RPV serotypes are also common. The common cereal aphids colonizing the SC winter wheat crop in the fall are Schizaphis graminum, Rhopalosiphum rufiabdominalis and R. padi. In the spring, R. padi and Sitobion avenae predominate. SC clones of these four aphid species were reared in NY and compared with NY clones of the same species for ability to transmit BYDV isolates from SC and NY. The NY and SC R. padi and S. avenae clones were similar in their ability to transmit BYDVs from either NY or SC. The NY clone of S. graminum was a vector of PAV and RPV, but the SC clone was unable to transmit either isolate. R. rufiabdominalis, which does not occur in NY, was an efficient vector of RP and PAV from NY and SC. R. padi is likely to be the primary vector for within crop transmission.