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Title: Races of Puccinia striiformis identified in the United States in 2009

Author
item WAN, ANMIN - Washington State University
item Chen, Xianming

Submitted to: American Phytopathological Society Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 4/1/2010
Publication Date: 6/1/2010
Citation: Wan, A., Chen, X. 2010. Races of Puccinia striiformis identified in the United States in 2009. American Phytopathological Society Annual Meeting. 100:S132.

Interpretive Summary:

Technical Abstract: Puccinia striiformis f. sp. tritici (PST) and P. striiformis f. sp. hordei (PSH) cause stripe rust on wheat and barley, respectively. To monitor virulence changes in the pathogen populations, stripe rust samples collected from 14 states were tested on 20 wheat and 12 barley differentials for identifying PST and PSH races, respectively. Six previously existing PSH races were detected, of which PSH-71 (virulent to Topper, Emir, Hiproly, Varunda, Abed Binder 12, Trumpf, Mazurka, Bigo, and Bancroft) was predominant. A total of 27 PST races were detected including new races PST-139 (virulent to Lemhi, Chinese 166, Heines VII, Paha, Druchamp, Produra, Yamhill, Stephens, Lee, Fielder, Tyee, Hyak, Yr8, Yr9, and Clement) and PST-140 (virulent to Lemhi, Heines VII, Moro, Produra, Stephens, Lee, Fielder, Tres, Express, Yr8, Yr9, Clement, and Compair). Races PST-139, PST-140, PST-114 (with all PST-140 virulences plus Yamhill), PST-116 (with all PST-114 virulences plus virulence to Paha), and PST-127 (with all PST-139 virulences, plus Moro, Express, and Compare) were predominant. The frequency of PST-127 increased from 1.5% in 2007 and 4.3% in 2008 in California and Washington to 9.1% in 2009 in California, Idaho, Oregon, and Washington. Twenty five of the 27 races were detected in the western U.S. while only five (PST-78, PST-80, PST-98, PST-100, and PST-102) were detected in the eastern U.S.