Barley yellow dwarf virus infection status of samples identified as containing either BYDV-Ker-II or BYDV-Ker-III isolates.

The specificity of the various RT-PCR assays used is given in parentheses. The identity of the RT-PCR products was determined (polyvalent RT-PCR1) or confirmed (RT-PCR 2, 3 and 4) by direct sequencing of the amplified products. Positive amplifications for which identity of the product was not confirmed by sequencing are identified by a +. Negative amplification results are identified by a - sign. nt: not tested.