A North American System of Nomenclature forPuccinia reconditaf. sp.tritici

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Abstract
A nomenclature system for designating virulence combinations of cultures of Puccinia recondita f. sp. tritici in North America is proposed the North American Wheat Leaf Rust Research Workers Committe. Host seedling resistance genes Lr1, 2a, 2c, 3, 3ka, 9, 11, 16, 17, 24, 26, and 30 occur singly in each of the primary differentials. Host lines are grouped into sets of four, and infection types are recorded for each line. Avirulence and virulence of cultures are determined by low and high infection types, respectively. Virulence combinations are to be designated by a three-letter code followed by a hypen and a listing of ineffective host genes in ay supplemental differential host set used. Additionally, a current leaf rust resistance series that consists of host genes Lr19,21,25,29,32, and RL6059 (Lr33 + 34) is recommended for evaluating bulk collections or composites of individual cultures. A supplemental series of Lr12, 13, 22a, 22b, and 34 adult-plant resistance genes is recommended for evaluating virulence to adult-plant resistance to leaf rust.