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Surveys for virus disease in potato ( Solanum tuberosum L.) ware crops were completed over three successive seasons. Overall mean incidence of viruses in plants derived from pathogen‐tested (PT®) seed lines and non‐PT seed lines was 2.2 and7.6% (1991),4.1 and 11.2% (1992), and 2.5 and 6.5% (1993) respectively. The levels of potato leaf‐roll virus and severe mosaics were particularly low in crops grown from PT® seed. Virus incidence was generally low apart from individual crops with high potato virus X, potato virus S (PVS), or potato virus Y (PVY) levels (these crops were often from saved seed tubers). The incidence of PVY N appears to have been contained through the use of PT® seed, but the identification of PVS A and the rediscovery of potato virus A and potato virus M are of some concern. Suggestions for improvements to seed quality control are discussed.
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Fletcher et al. (1996) studied this question.
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