Tobacco streak, broad bean wilt, cucumber mosaic, and alfalfa mosaic viruses associated with ring spot of Ajuga reptans in Australia.

Abstract

A. reptans plants at 3 locations in and around Melbourne, displaying ring spot, line pattern, scattered yellow spots and yellow leaf margins were infected singly by TSV (Ajuga-TSV), BBWV (Ajuga I-BBWV) and CMV. Plants at a 4th location showed a very mild chlorotic mottle, faint ring spot and contained AMV and BBWV (Ajuga II-BBWV) simultaneously. The Ajuga-TSV isolate was distinct from the Ageratum houstonianum isolate from Qd. in agar gel diffusion and cross-protection tests, and is apparently a new TSV str. occurring in Australia. Ajuga I-BBWV was serotype I of the virus whereas Ajuga II-BBWV is possibly a 3rd, previously unrecorded serotype. This is the first report of AMV and CMV in A. reptans in Australia and of A. reptans as a natural host of TSV and BBWV.