Abstract
The enzyme‐linked immunosorbent assay (ELISA) effectively detected PAV‐ and MAV‐like strains of barley yellow dwarf virus (BYDV) in ryegrass. MAV‐like BYDV was found in a large proportion of ryegrass plants with foliar symptoms. There was a poor association between foliar symptoms and PAV‐like virus, which occurred with similar frequency in plants with and without symptoms. By August 1982, plots of perennial, Italian and hybrid ryegrass sown at Auchincruive in 1980 were extensively infected with PAV‐ and MAV‐like strains of BYDV. Tests on samples from 1981‐ and 1982‐sown plots in August 1983 also indicated early invasion by BYDV. Infection levels of 7–80% were found in 13 commercial crops of perennial ryegrass surveyed near Auchincruive in May 1983. PAV‐like BYDV occurred with greater frequency than did MAV‐like strains of the virus.
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