Submitted to: Wheat Newsletter
Publication Type: Other
Publication Acceptance Date: 3/9/2007
Publication Date: 8/1/2007
Citation: Long, D.L., Kolmer, J.A., Jin, Y., Hughes, M.E. 2007. Wheat rusts in the united states in 2006. Annual Wheat Newsletter. 53:130-141.
Interpretive Summary: Wheat stem rust was reported in isolated locations on susceptible wheats in the United States in 2006. Almost all collections were found to be the race QFCS, which is not virulent to almost all spring and winter wheats currently grown in the United States. Wheat leaf rust was found throughout the eastern states and the Great Plains region on susceptible and resistant wheat cultivars. Over 60 races of wheat leaf rust were described in 2006. Virulence to resistance genes Lr17, Lr24, and, Lr9, and Lr16 has increased in recent years. Wheat stripe rust was found in the Pacific Northwest region and in isolated locations in the eastern states and Great Plains region.
Technical Abstract: Wheat stem rust was found in scattered locations in the southern and northern Great Plains, and the southeastern states in 2006. Race QFCS accounted for nearly all the collections of wheat stem rust that were tested for virulence. Race MCCD was found in one collection from Texas. Collections of rye stem rust were made from barberry bushes in Minnesota and Wisconsin. Wheat leaf rust was widespread on different wheat cultivars throughout the Great Plains region, southeastern states, and Ohio Valley area. Significant yield losses due to leaf rust in winter and spring wheats were expected in the Great Plains region. Sixy races of wheat leaf rust were identified in 2006. Frequency of isolates with virulence to gene Lr24 increased from 2005. Races with virulence to Lr9 and Lr41 also increased in 2006. Wheat stripe rust was found in scattered locations in the southern Great Plains in 2006, and was commonly found in the Pacific Northwest region. Stripe rust was also found in scattered locations in the southeastern states and Ohio Valley area.