It has been postulated that wheat (Triticum aestivum) cultivars Cappelle Desprez, Druchamp, Hybrid 46, Minister, Nord Desprez, Stephens, Vilmorin 23, and Yamhill have genes for resistance to stripe rust at the Yr3 locus and or the Yr4 locus. Seedlings of parents and F 1 and F 2 progeny from diallel crosses among the cultivars and of the eight cultivars crossed with Chinese 166 were tested for resistance to selected North American races of Puccinia striiformis. Seedlings of some BC 1 progeny also were tested. Yamhill has three resistance genes; the other cultivars have two resistance genes. Common loci were not detected in crosses of Hybrid 46 with Druchamp, Minister, or Stephens nor in crosses of Yamhill with Stephens []
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Xianming Chen (1993) studied this question.