Richard W. Smiley, Columbia Basin Agricultural Research Center, Oregon State University, Pendleton;
Juliet M. Marshall, Cereals Research and Extension Program, University of Idaho, Idaho Falls 83402;
Jennifer A. Gourlie, Columbia Basin Agricultural Research Center, Oregon State University;
Timothy C. Paulitz, United States Department of Agriculture–Agricultural Research Service (USDA-ARS) Root Disease and Biological Control Unit, Washington State University, Pullman 99164;
Shyam L. Kandel, Department of Plant Pathology, and
Michael O. Pumphrey, Department of Crop and Soil Sciences, Washington State University, Pullman;
Kimberly Garland-Campbell, USDA-ARS Wheat Genetics, Quality, Physiology, and Disease Research Unit, Washington State University, Pullman;
Guiping Yan, Columbia Basin Agricultural Research Center, Oregon State University;
Monte D. Anderson, Bayer CropScience, Spangle, WA 99031;
Michael D. Flowers, Department of Crop and Soil Science, Oregon State University, Corvallis 97331; and
Chad A. Jackson, Cereals Research and Extension Program, University of Idaho, Aberdeen 83210
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Accepted for publication 28 November 2012.
The cereal cyst nematode Heterodera avenae reduces wheat yields in the Pacific Northwest. Previous evaluations of cultivar resistance had been in controlled environments. Cultivar tolerance had not been evaluated. Seven spring wheat trials were conducted in naturally infested fields in three states over 2 years. A split-plot design was used for all trials. Five trials evaluated both tolerance and resistance in 1.8-by-9-m plots treated or not treated with nematicides. Two trials evaluated resistance in 1-m head rows where each wheat entry was paired with an adjacent row of a susceptible cultivar. Cultivars with the Cre1 resistance gene (‘Ouyen’ and ‘Chara’) reduced the postharvest density of H. avenae under field conditions, confirming Cre1 parents as useful for germplasm development. Ouyen was resistant but it was also intolerant, producing significantly lower grain yield in controls than in plots treated with nematicides. Susceptible cultivars varied in tolerance. Undefined resistance was identified in one commercial cultivar (‘WB-Rockland) and four breeding lines (UC1711, SO900163, SY-B041418, and SY-97621-05). This research was the first systematic field demonstration of potential benefits to be derived through development and deployment of cultivars with resistance plus tolerance to cereal cyst nematode in North America.
© 2013 The American Phytopathological Society