Risk Index for Barley Yellow Dwarf Virus and Cereal Yellow Dwarf Virus of Wheat in Alabama

摘要

In the state of Alabama, USA, soft red winter wheat production is valued at as much as US$15 million. Wheat production throughout the state is limited, however, by the diseases of wheat caused by Barley yellow dwarf virus (BYDV, strain PAV, genus Luteovirus) and Cereal yellow dwarf virus (CYDV, strain RPV, genus Polerovirus). These viruses are vectored by several aphids commonly found in Alabama, notably greenbug (Schizaphis graminum), English grain aphid (Sitobion avenae), bird cherry-oat aphid (Rhopalosiphum padi), rice root aphid (R. rufiabdominalis), and corn leaf aphid (R. maidis) (Halbert and Voegtlin, 1995; van Riessen et al, 1998).