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Disease Note.

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.

Reference: (1) W. R. Allen and J. A. Matteoni. Can. J. Plant Pathol. 10:41. 1988.