Some properties and thrip transmission of tomato spotted wilt virus in Canada

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Abstract
A virus isolated from white clover (Trifolium repens L.), dahlia, and tomato from Ontario, dahlia from Manitoba, and tomato and dahlia from British Columbia was identified as tomato spotted wilt virus (TSWV). Seven isolates of the virus examined had similar host reactions; four of them, investigated in detail, were similar in their localization in tomato leaf cells and physical properties also. The virus particles, 78–97 nm in diameter, were abundant in tomato leaf mesophyll cells and occurred in clusters or arrays surrounded by a membrane.The virus was purified by a method modified from a previously reported one and a specific antiserum was prepared. TSWV appears to be weakly immunogenic, as a high titer antiserum could not be obtained.At least three species of thrips, i.e. Thrips tabaci Lind., Frankliniella fusca Hinds, and F. occidentalis Perg., known as vectors of TSWV elsewhere, occur in Canada. F. fusca, which occurs in eastern Canada, efficiently transmitted all isolates of the virus. T. tabaci, a vector in several countries and widespread in Canada, failed to transmit the virus.

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