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Potato viruses not known in Europe are listed and discussed in the context of risks they present to potato growing in western Europe. Aspects of mode of entry via true seed, tissue culture, rooted cuttings or tubers are assessed and the latest position is outlined in relation to developments within EPPO and the EEC. A suggested approach to post‐entry quarantine testing for such material is given.
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Phil Howell (1981) studied this question.
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