Abstract
Long-day-adaptedSolanum phureja clones were assessed for resistance to blackleg caused byErwinia carotovora subsp.atroseptica under field and controlled environmental conditions over two years. In the field, twenty-two of the twenty-three clones ofS. phureja assessed were as resistant to blackleg as the commercial cultivar Ailsa, the most resistant control, and were significantly (P<0.001) more resistant than the intermediate and susceptible cultivars Wilja and Estima, respectively. Under controlled environmental conditions, resistance in commercial cultivars was more easily overcome. However, 18 of the 21S. phureja clones assessed were significantly more resistant to blackleg than these cultivars.
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