Races of Puccinia graminis on barley, oat, and wheat in Canada in 2007 and 2008.

Fetch Jr., T.G., Mitchell Fetch, J.W., and Xue, A.G. (2015). "Races of Puccinia graminis on barley, oat, and wheat in Canada in 2007 and 2008.", Canadian Journal of Plant Pathology, 37(3), pp. 331-341. doi : 10.1080/07060661.2015.1066865  Access to full text

Abstract

Stem rust, caused by Puccinia graminis, has historically been the most important disease of cereal crops worldwide. It is primarily controlled using resistant cultivars in Canada, although prophylactic use of fungicides is increasing. Determining the virulence structure in pathogen populations is essential to detect new virulent races that may arise. Surveys of barley (Hordeum vulgare), oat (Avena sativa), and wheat (Triticum aestivum) fields and trap nurseries were conducted to provide incidence and severity information and to identify the virulence structure in the pathogen populations. Stem rust samples were collected across Canada in 2007 and 2008. Stem rust was absent on cultivated wheat, and at trace levels in barley and oat fields. Race QFCSC of P. graminis f. sp. tritici was dominant in 2007 (95.9%) and 2008 (98.2%) and was the only race present in Quebec, Ontario, Saskatchewan, and Alberta, while races RKQQC, RKQSC, TMRTF, and TPMKC were found at trace levels in Manitoba. Eleven races of P. graminis f. sp. avenae were found in 2007, and races TGD (31.7%), TJJ (17.4%), TJS (16.7%), and TGB (13.7%) were dominant. Race TJN, which was first detected in 2006, rose to 8.5% of the population in 2007. Ten races of P. graminis f. sp. avenae were found in 2008 and races TGD (49.7%) and TJJ (21.1%) were dominant. Race TGN, which was first detected in 2006, rose to 10.9% of the population in 2008. No new races of P. graminis f. sp. tritici or P. graminis f. sp. avenae were detected in Canada in 2007 or 2008.

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