Tomato Spotted Wilt Virus in Greenhouse Crops in Ontario. J. A. Matteoni, Agriculture Canada Research Station, Vineland Station, Ontario L0R 2E0. W. R. Allen, and A. B. Broadbent. Agriculture Canada Research Station, Vineland Station, Ontario L0R 2E0. Plant Dis. 72:801. Accepted for publication 7 July 1988. Copyright 1988 The American Phytopathological Society. DOI: 10.1094/PD-72-0801A.
Since 1984, tomato spotted wilt virus (TSWV) has caused production
losses in 32 greenhouse operations, principally in the Niagara Peninsula
and southwestern Ontario. TSWV was identified on the bases of
symptoms in assay hosts (1), immunosorbent electron microscopy, and
ELISA. Based on representative samples, the most frequently infected
crops were New Guinea impatiens, gloxinia, tomato, cineraria,
cyclamen, and calceolaria. Other infected crops included begonia,
marigold, ageratum, dahlia, calendula, and primrose. All diseased
crops were infested with the vector, Frankliniella occidentalis
(Pergande). In some cases, TSWV outbreaks were associated with the
introduction of infected New Guinea impatiens (Impatiens wallerana
Hook f.). Complete eradication of the virus has not been possible except
when the virus was detected early and thrips population levels were low.