A SURVEY OF BARLEY YELLOW DWARF VIRUS IN S.24 PERENNIAL RYEGRASS IN ENGLAND AND WALES, 1966.

A survey of barley yellow dwarf virus (BYDV) in S.24 perennial ryegrass in England and Wales was carried out between January and March 1966. Of the 112 samples tested, 104 were infected and this included many samples which appeared healthy. Many of the virus isolates were severe strains and these were mainly transmitted by Rhopalosiphum padi, the most efficient vector. There was no evidence of regional distribution of the virus. [ABSTRACT FROM AUTHOR]