Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2006
Publication Date: 7/1/2007
Citation: Chen, X. 2007. Strategies for controlling increasingly important stripe rusts of wheat and barley. American Phytopathological Society Abstracts, San Diego, CA, 7/27-8/2/07, 97:S166.
Technical Abstract: Stripe rust of wheat, caused by Puccinia striiformis f. sp. tritici, has historically been a destructive disease in the western United States, but has become increasingly important in the Great Plains and southeastern states since 2000. The disease has caused yield losses of more than 231 million bushels in the last six years plus multimillion dollars spent on fungicide application in the U.S. Stripe rust of barley, caused by P. striiformis f. sp. hordei, has become established and caused significant yield losses in the western U.S. since 1991 when the pathogen was first reported in southern Texas. The diseases have been monitored through trap plots and field surveys by collaborators throughout the nation. Virulence changes of the pathogens have been determined by testing stripe rust samples on the sets of wheat and barley differential genotypes. Wheat and barley germplasms have been evaluated in fields under natural infections and in the greenhouse with selected races of the pathogens to provide effective sources of resistance to breeding programs. High-temperature, adult-plant (HTAP) resistance has proven to be durable and effective in control of stripe rusts of wheat and barley in most epidemic regions. Combining genes for HTAP and effective all-stage resistance should be the best approach to achieve sustainable control of stripe rust. Molecular markers for resistance genes have been identified and used to improve the efficiency of developing resistant cultivars. Timely use of effective fungicides is still needed to reduce yield losses when susceptible cultivars are grown and when previously resistant cultivars become susceptible.