Tobacco ringspot virus in horseradish

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Abstract
Tobacco ringspot virus (TRSV) is recorded for the first time in New Zealand. It was found occurring naturally on horseradish, a symptomless host, and has been transferred experimentally to produce symptoms on tobacco, cucumber, cowpea, French bean, Cheno-podium amaranticolor, and C. quinoa. No nematode, insect, or seed transmission experiments were attempted. Surveys showed the nematode vector Xiphinema americanum to be absent from soil around horseradish plants infected with TRSV. The host range, physical properties, sedimentation coefficients, serology, and electron microscopy of the virus show that it is tobacco ringspot virus.