Abstract
Two hundred and fifty-five accessions to the USDA world onion germplasm collection and 66 commercial cultivars of Allium cepa were screened for resistance to Urocystis magica, the causal agent of onion smut. The trial was conducted in Cloverdale, British Columbia on a muck soil heavily infested with U. magica. Percent smut infection in bulbs at harvest was measured and significant differences (P = 0.01) among the accessions and cultivars occurred. Three plant introduction lines and one commercial cultivar were completely resistant to U. magica in the trial and significant levels of resistance were found in six other plant introduction lines and one commercial cultivar.
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