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Submitted to: Canadian Journal of Plant Pathology
Publication Type: Peer Reviewed Journal Publication Acceptance Date: 5/8/2014 Publication Date: 6/6/2014 Publication URL: http://www.tandfonline.com/doi/pdf/10.1080/07060661.2014.924560 Citation: Chen, X. 2014. Integration of cultivar resistance and fungicide application for control of wheat stripe rust. Canadian Journal of Plant Pathology. 36:311-326. Interpretive Summary: Stripe rust is one of the most destructive diseases of wheat. The disease is mainly controlled by growing resistant cultivars and applying fungicides when necessary. To determine potential yield loss and fungicide response, major cultivars grown in the US Pacific Northwest and susceptible checks were tested in field experiments every year. From 2002 to 2012, stripe rust caused yield losses from 18% to more than 90% and from 5% to more than 50% with an average of 44% and 33% on susceptible winter and spring wheat checks, respectively. Without fungicide application, the commercially grown cultivars with various levels of stripe rust resistance could reduce potential yield losses to 2-21% with an average of 8% for winter wheat and to 0-27% with an average of 13% for spring wheat, respectively. Significant or insignificant effect of fungicide application on yield increase was determined for each cultivar, and the results were used to guide stripe rust management by selecting resistant cultivars to grown and appropriately applying fungicides under different levels of stripe rust epidemic. The results should be useful for breeding programs to developing wheat cultivars with high level and durable resistance, and for improving chemical control in order to minimize yield losses and maximize profits while protect the environment by reducing use of fungicides. Technical Abstract: Stripe rust, caused by Puccinia striiformis, f. sp. tritici, is one of the most destructive diseases of wheat. The disease is mainly controlled by growing resistant cultivars and applying fungicides when necessary. To determine potential yield loss and fungicide response, major cultivars grown in the US Pacific Northwest and susceptible checks were tested in complete split-block design experiments every year. From 2002 to 2012, stripe rust caused yield losses from 18% to more than 90% and from 5% to more than 50% with an average of 44% and 33% on susceptible winter and spring wheat checks, respectively. Without fungicide application, the commercially grown cultivars with various levels of stripe rust resistance could reduce potential yield losses to 2-21% with an average of 8% for winter wheat and to 0-27% with an average of 13% for spring wheat, respectively. Significant or insignificant effect of fungicide application on yield increase was determined for each cultivar, and the results were used to guide stripe rust management by selecting resistant cultivars to grown and appropriately applying fungicides under different levels of stripe rust epidemic. The results should be useful for breeding programs to developing wheat cultivars with high level and durable resistance, and for improving chemical control in order to minimize yield losses and maximize profits while protect the environment by reducing use of fungicides. |
