Virulence ofPuccinia reconditain the Pacific Northwest
- 1 January 1980
- journal article
- research article
- Published by Scientific Societies in Plant Disease
- Vol. 64 (1) , 78-80
- https://doi.org/10.1094/pd-64-78
Abstract
Virulence for resistance genes Lr1, Lr2a, Lr2b, Lr2d, Lr3a, Lr3bg, Lr10, L415, Lr16, Lr17 and Lr18 was found among collections of P. recondita f. sp. tritici (the causal agent of wheat [Triticum aestivum] leaf rust) from Washington and adjacent Idaho and Oregon. No virulence for genes Lr3b, Lr3ka, Lr9, Lr11, Lr19, Lr24, LrEG or LrT was detected. The races of P. recondita were most clearly differentiated on isolines having Lr1 and Lr2a. Western P. recondita race 1 (WPR-1) was a virulent on both isolines, WPR-2 was avirulent on Lr2a and virulent on Lr1, WPR-3 was avirulent on Lr1 and virulent on Lr2a, and WPR-4 was virulent on both isolines. Race WPR-2 is widely distributed throughout the Pacific Northwest east of the Cascade Mountains and is currently the most important race. More than 99% of the wheat acreage and all newly released cultivars in the Pacific Northwest are susceptible to race WPR-2.Keywords
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