Abstract
SummaryThe extent to which resistance to leek rust (Puccinia allii) in commercially useful cultivars of leek (Allium ampeloprasum) could be developed by selection within current commercial cultivars or their recent predecessors was investigated. Differences in resistance among commercial cultivars was not great. However, a wide range of resistance levels was found in both half‐sib and inbred progeny derived from these cultivars. In a crop simulation, one of the breeding lines showed a reduction in the rate of new pustule appearance of 44% compared to cv. Wintra. It is concluded that selection within modern cultivar level material is a potentially productive strategy for the commercial development of leek rust resistance in the short to medium term.
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