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ARS Home » Pacific West Area » Corvallis, Oregon » Forage Seed and Cereal Research » People & Locations » Ryan Hayes

Ryan J Hayes
Forage Seed and Cereal Research
Research Leader

Phone: (541) 738-4125
Fax: (541) 738-4160

3450 SW CAMPUS WY
CORVALLIS , OR 973318539
Projects
Multi-Objective Optimization of a Profitable and Environmentally Sustainable Agriculture to Produce Food and Fiber in a Changing Climate
In-House Appropriated (D)
  Accession Number: 425611
Developing Methods to Improve Survival and Maximize Productivity and Sustainability of Pacific Shellfish Aquaculture
In-House Appropriated (D)
  Accession Number: 428121
Disease Modeling and Genetic Approaches to Enhance Wheat and Grass Seed Crop Biosecurity
In-House Appropriated (D)
  Accession Number: 432655
Genetic Improvement of Oyster Stocks for the Pacific Northwest
In-House Appropriated (D)
  Accession Number: 433817
Improvement of Biotic and Abiotic Stress Tolerance in Cool Season Grasses
In-House Appropriated (D)
  Accession Number: 434293
Breeding, Genomics, and Integrated Pest Management to Enhance Sustainability of U.S. Hop Production and Competiveness in Global Markets
In-House Appropriated (D)
  Accession Number: 434455
Collaborative Institutional Biosafety Committee Oversight and Research between Oregon State University and the ARS Corvallis location.
Non-Funded Cooperative Agreement (N)
  Accession Number: 431064
California-Adapted Barleys for Resistance to Stem Rust (UG99) - An Integrated Effort
Non-Assistance Cooperative Agreement (S)
  Accession Number: 433070
Breeding Disease Resistant Hop Cultivars
Non-Assistance Cooperative Agreement (S)
  Accession Number: 433860
Northwest-Adapted Barleys for Resistance to Stem Rust (UG99)
Non-Assistance Cooperative Agreement (S)
  Accession Number: 429931
USDA-ARS Breeding for Aroma Hops with Disease Resistance
Trust Fund Cooperative Agreement (T)
  Accession Number: 433032

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Accuracy, reliability, and timing of visual evaluations of decay in fresh-cut lettuce -
Simko, I., Hayes, R.J. 2018. Accuracy, reliability, and timing of visual evaluations of decay in fresh-cut lettuce. PLoS One. 13(4):e0194635. https://doi.org/10.1371/journal.pone.0194635.
Molecular markers reliably predict post-harvest decay of fresh-cut lettuce in modified atmosphere packaging -
Simko, I., Hayes, R.J., Truco, M., Michelmore, R.W., Antonise, R., Massoudi, M. 2018. Molecular markers reliably predict post-harvest decay of fresh-cut lettuce in modified atmosphere packaging. Horticulture Research. 5:21. https://doi.org/10.1038/s41438-018-0022-5.
Release of three iceberg lettuce populations that combined resistance to two soil borne diseases -
Hayes, R.J., Sandoya, G., Mou, B., Simko, I., Subbarao, K.V. 2018. Release of three iceberg lettuce populations that combined resistance to two soil borne diseases. HortScience. 53:247-250.
Breeding and genetics of lettuce for resistance against race 2 Verticillium wilt -
Sandoya, G.V., Truco, M.J., Subbarao, K.V., Martin, F.N., Michelmore, R.M., Hayes, R.J., Simko, I. 2017. Breeding and genetics of lettuce for resistance against race 2 Verticillium wilt. National Association of Plant Breeders Annual Meeting, August 7-10, 2017, Davis, California.
Genome-wide association study for lettuce cultivars with improved salad processing efficiency -
Sthapit, J.K., Mou, B., Simko, I., Hayes, R.J. 2017. Genome-wide association study for lettuce cultivars with improved salad processing efficiency. American Society for Horticultural Science Annual Meeting, September 19-22, 2017, Waikoloa, Hawaii.
Genetic characterization of resistance to Sclerotinia in lettuce cultivar Eruption -
Mamo, B.E., Hayes, R.J., Truco, M.J., Michelmore, R., Subbarao, K.V., Simko, I. 2017. Genetic characterization of resistance to Sclerotinia in lettuce cultivar Eruption. American Phytopathological Society Annual Meeting, August 5-9, 2017, San Antonio, Texas.
Characterization of Verticillium dahliae disease reactions in lettuce differential cultivars -
Short, D.P.G., Puri, K., Sandoya, G.V., Simko, I., Hayes, R.J., Subbarao, K.V. 2017. Characterization of Verticillium dahliae disease reactions in lettuce differential cultivars. American Phytopathological Society Annual Meeting, August 5-9, 2017, San Antonio, Texas.
Nondestructive phenotyping of lettuce plants in early stages of development with optical sensors -
Simko, I., Hayes, R.J., Furbank, R.T. 2016. Nondestructive phenotyping of lettuce plants in early stages of development with optical sensors. Frontiers in Plant Science. 7:1-19.
Genetics of resistance in lettuce to races 1 and 2 of Verticillium dahliae from different host species -
Sandoya, G.V., Gurung, S., Short, D.P., Subbarao, K.V., Michelmore, R.M., Hayes, R.J. 2016. Genetics of resistance in lettuce to races 1 and 2 of Verticillium dahliae from different host species. Euphytica. 213:20. doi: 10.1007/s10681-016-1813-0.
Genetics of the partial resistance against race 2 of Verticillium dahliae in lettuce -
Sandoya, G.V., Truco, M., Bertier, L., Subbarao, K.V., Michelmore, R., Simko, I., Hayes, R.J. 2016. Genetics of the partial resistance against race 2 of Verticillium dahliae in lettuce. American Society for Horticultural Science Annual Meeting. Available: https://ashs.confex.com/ashs/2016/webprogram/Paper24442.html.
Lettuce and spinach breeding -
Simko, I., Hayes, R.J., Mou, B., McCreight, J.D. 2016. Lettuce breeding. California Leafy Greens Research Board Annual Meeting. Available: http://calgreens.org/wp-content/uploads/2016/06/Lettuce-Breeding-USDA-ARS-Simko-Mou-and-McCreight.pdf.
Breeding lettuce for improved fresh-cut processing -
Hayes, R.J., Simko, I. 2016. Breeding lettuce for improved fresh-cut processing. Acta Horticulturae. 1141:65-76. doi: 10.17660/ActaHortic.2016.1141.7.
Assessing genetic variation in lettuce for traits related to nitrogen use efficiency using susceptibility and relative efficiency indices -
Gonzalez, M.M., Truco, M., Michelmore, R., Smith, R., Cahn, M., Simko, I., Hayes, R.J. 2015. Assessing genetic variation in lettuce for traits related to nitrogen use efficiency using susceptibility and relative efficiency indices. ASA, CSSA, and SSSA Annual Meeting. Available: https://scisoc.confex.com/scisoc/2015am/webprogram/Paper93179.html.
Comparing the predictive abilities of phenotypic and marker-assisted selection methods in a biparental lettuce population Reprint Icon -
Hadasch, S., Simko, I., Hayes, R.J., Ogutu, J.O., Piepho, H.-P. 2016. Comparing the predictive abilities of phenotypic and marker-assisted selection methods in a biparental lettuce population. The Plant Genome. 9(1):1-11.
USDA lettuce breeding and genetics -
Hayes, R.J. 2015. USDA lettuce breeding and genetics. University of California SeedCentral Forum, June 25, 2015, Salinas, California.
Breeding lettuce for fresh-cut processing -
Hayes, R.J., Simko, I. 2015. Breeding lettuce for fresh-cut processing. III International Conference on Fresh-cut Produce: Maintaining Quality and Safety, September 13-18, 2015, Davis, California.
Sustainable lettuce: Adaptability to uncertain production conditions -
Hayes, R.J. 2015. Sustainable lettuce: Adaptability to uncertain production conditions. American Society for Horticultural Science Annual Meeting, "Climate Change - Realities, Controversies, and Responses" Colloquium, August 3-7, 2015, New Orleans, Louisiana.
Non-defoliating and defoliating strains from cotton correlate with races 1 and 2 of Verticillium dahliae -
Hu, X., Gurung, S., Short, D.P., Sandoya, G., Shang, W., Hayes, R.J., Subbarao, K.V. 2015. Non-defoliating and defoliating strains from cotton correlate with races 1 and 2 of Verticillium dahliae. Plant Disease. doi: 10.1094/PDIS-03-15-0261-RE.
Resistance to downy mildew in lettuce ‘La Brillante’ is conferred by dm50 gene and multiple QTL -
Simko, I., Ochoa, O.E., Pel, M.A., Tsuchida, C., Forcada, C.F., Hayes, R.J., Truco, M.J., Antonise, R., Galeano, C.H., Michelmore, R.W. 2015. Resistance to downy mildew in lettuce ‘La Brillante’ is conferred by dm50 gene and multiple QTL. Phytopathology. 105:1220-1228.
Screening of wild and cultivated Capsicum germplasm reveals new sources of Verticillium wilt resistance -
Gurung, S., Short, D.P., Hu, X., Sandoya, G., Hayes, R.J., Subbarao, K.V. 2015. Screening of wild and cultivated Capsicum germplasm reveals new sources of Verticillium wilt resistance. Plant Disease. doi: 10.1094/PDIS-01-15-0113-RE.
Breeding and genetics of lettuce against race 2 of Verticillium wilt -
Sandoya, G., Michelmore, R., Subbarao, K.V., Hayes, R.J. 2015. Breeding and genetics of lettuce against race 2 of Verticillium wilt. EUCARPIA Leafy Vegetables Congress, April 14-17, 2015, San Pedro del Pinatar, Spain.
Genetics and breeding of bacterial leaf spot resistance -
Hayes, R.J., Michelmore, R., Bull, C.T. 2015. Genetics and breeding of bacterial leaf spot resistance. EUCARPIA Leafy Vegetables Congress, April 14-17, 2015, San Pedro del Pinatar, Spain.
Host range of Verticillium isaacii and Verticillium klebahnii from artichoke, spinach, and lettuce -
Gurung, S., Short, D.P., Hu, X., Sandoya, G., Hayes, R.J., Koike, S., Subbarao, K.V. 2015. Host range of Verticillium isaacii and Verticillium klebahnii from artichoke, spinach, and lettuce. Plant Disease. doi: 10.1094/PDIS-12-14-1307-RE.
Dynamics of Verticillium species microsclerotia in field soils in response to fumigation, cropping patterns, and flooding -
Short, D., Sandoya, G., Vallad, G., Koike, S., Xiao, C., Wu, B., Gurung, S., Hayes, R.J., Subbarao, K. 2015. Dynamics of Verticillium species microsclerotia in field soils in response to fumigation, cropping patterns, and flooding. Phytopathology. 105:638-645.
The inheritance of resistance to bacterial leaf spot of lettuce caused by Xanthomonas campestris pv. vitians in three lettuce cultivars -
Hayes, R.J., Trent, M., Truco, M., Antonise, R., Michelmore, R.W., Bull, C.T. 2014. The inheritance of resistance to bacterial leaf spot of lettuce caused by Xanthomonas campestris pv. vitians in three lettuce cultivars. Horticulture Research. 1:14066.
Host genotype and hypersensitive reaction influence population levels of Xanthomonas campestris pv. vitians in lettuce -
Bull, C.T., Gebben, S.J., Goldman, P.H., Trent, M., Hayes, R.J. 2015. Host genotype and hypersensitive reaction influence population levels of Xanthomonas campestris pv. vitians in lettuce. Phytopathology. 105:316-324.
Inheritance of decay of salad-cut lettuce in a recombinant inbred line population from ‘Salinas 88’ x ‘La Brillante’ -
Hayes, R.J., Galeano, C.H., Luo, Y., Antonise, R., Simko, I. 2014. Inheritance of decay of salad-cut lettuce in a recombinant inbred line population from ‘Salinas 88’ x ‘La Brillante’. Journal of the American Society for Horticultural Science. 139:388-398.
Characterization and performance of 16 new inbred lines of lettuce Reprint Icon -
Simko, I., Hayes, R.J., Bull, C.T., Mou, B., Luo, Y., Trent, M.A., Atallah, A.J., Ryder, E.J., Sideman, R.G. 2014. Characterization and performance of 16 new inbred lines of lettuce. HortScience. 49:679-687.
Notice of release of iceberg, romaine, and leaf lettuce breeding lines with improved disease resistance -
Simko, I., Hayes, R.J. 2014. Notice of release of iceberg, romaine, and leaf lettuce breeding lines with improved disease resistance. Germplasm Release. Available: http://calgreens.org/wp-content/uploads/2014/03/USDA-Releases-Sixteen-New-Breeding-LInes-of-Lettuce1.pdf.
Development of a high-density intra-specific linkage map of lettuce using genotyping by sequencing (GBS) -
Galeano, C.H., Froenicke, L., Duitama, J., Kozik, A., Reyes-Chin-Wo, S., Simko, I., Hayes, R.J., Michelmore, R. 2014. Development of a high-density intra-specific linkage map of lettuce using genotyping by sequencing (GBS). Plant and Animal Genome XXII Conference, January 11-15, 2014, San Diego, California. P686.
Baby leaf lettuce germplasm enhancement: developing diverse populations with resistance to bacterial leaf spot caused by Xanthomonas campestris pv. vitians -
Hayes, R.J., Trent, M.A., Mou, B., Simko, I., Gebben, S.J., Bull, C.T. 2014. Baby leaf lettuce germplasm enhancement: developing diverse populations with resistance to bacterial leaf spot caused by Xanthomonas campestris pv. vitians. HortScience. 49:18–24.
Yield gains in leafy vegetables -
Simko, I., Hayes, R.J., Mou, B., McCreight, J.D. 2014. Yield gains in leafy vegetables. In: Smith, S., Diers, B., Specht, J., Carver, B., editors. Yield gains in major U.S. field crops. CSSA Special Publications 33. Madison, WI: American Society of Agronomy, Inc., Crop Science Society of America, Inc., and Soil Science Society of America, Inc. p. 53-86.
Evaluation and Quantitative trait loci mapping of resistance to powdery mildew in lettuce -
Simko, I., Rauscher, G., Sidemann, R., McCreight, J.D., Hayes, R.J. 2013. Evaluation and Quantitative trait loci mapping of resistance to powdery mildew in lettuce. Plant Pathology. DOI: 10.1111/ppa.12087.
Detection and quantification of Verticillium dahliae in spinach seed -
Duressa, D., Rauscher, G.M., Koike, S.T., Mou, B., Hayes, R.J., Maruthachalam, K., Subbarao, K.V., Klosterman, S.J. 2013. Detection and quantification of Verticillium dahliae in spinach seed. Acta Phytopathologica Sinica. 43 (supplement):245.
Computing Integrated Ratings from Heterogeneous Phenotypic Assessments: A Case Study of Lettuce Postharvest Quality and Downy Mildew Resistance -
Simko, I., Hayes, R.J., Kramer, M.H. 2012. Computing integrated ratings from heterogeneous phenotypic assessments: A case study of lettuce postharvest quality and downy mildew resistance. Crop Science. 52:2131-2142.
A real-time PCR assay for detection and quantification of verticillium dahliae in spinach seed -
Duressa, D.O., Rauscher, G.M., Koike, S.T., Mou, B., Hayes, R.J., Maruthachalam, K., Subbarao, K.V., Klosterman, S.J. 2012. A real-time PCR assay for detection and quantification of verticillium dahliae in spinach seed. Phytopathology. 102:443-451.
Selection for resistance to Verticillium wilt caused by race 2 isolates of Verticillium dahliae in accessions of lettuce (Lactuca sativa L.). -
Hayes, R.J., Maruthachalam, K., Vallad, G.E., Klosterman, S.J., Subbarao, K.V. 2011. Selection for resistance to Verticillium wilt caused by race 2 isolates of Verticillium dahliae in accessions of lettuce (Lactuca sativa L.).HortScience. 46(2):201-206.
Development of a qPCR assay for quantification of verticillium dahliae in spinach seed. -
Duressa, D.O., Rauscher, G.M., Mou, B., Hayes, R.J., Koike, S.T., Maruthachalam, K., Subbarao, K.V., Klosterman, S.J. 2011. Development of a qPCR assay for quantification of verticillium dahliae in spinach seed.Phytopathology. 101:S46.
Verticillium comparative genomics yields insights into niche adaptation by plant vascular wilt pathogens. -
Klosterman, S.J., Subbarao, K.V., Kang, S., Veronese, P., Gold, S.E., Thomma, B., Chen, Z., Henrissat, B., Lee, Y., Park, J., Garcia-Pedrajas, M.D., Barbara, D., Anchieta, A.G., Jonge, R., Santhanam, P., Maruthachalam, K., Atallah, Z.K., Amyotte, S., Paz, Z., Inderbitzin, P., Hayes, R.J., Heiman, D., Young, S., Zeng, Q., Engels, R., Galagan, J., Cuomo, C., Dobinson, K.F., Ma, L. 2011. Verticillium comparative genomics yields insights into niche adaptation by plant vascular wilt pathogens. Phytopathology. 101:S208.
Lettuce cultivar influences Xanthomonas campestris pv. vitians population levels -
Gebben, S., Hayes, R.J., Bull, C.T. 2011. Lettuce cultivar influences Xanthomonas campestris pv. vitians population levels. Phytopathology. 101:S59.
SSH reveals a linkage between a senescence-associated protease and Verticillium wilt symptom development in lettuce (Lactuca sativa) -
Klosterman, S.J., Anchieta, A.G., Garcia-Pedrajas, M.D., Maruthachalam, K., Hayes, R.J., Subbarao, K.V. 2011. SSH reveals a linkage between a senescence-associated protease and Verticillium wilt symptom development in lettuce (Lactuca sativa). Physiological and Molecular Plant Pathology. 76:48-58.
Comparative genomics yields insights into niche adaptation of plant vascular wilt pathogens. Reprint Icon -
Klosterman, S.J., Subbarao, K.V., Kang, S., Veronese, P., Gold, S.E., Thomma, B.P.H.J, Chen, Z., Henrissat, B., Lee, Y., Park, J., Garcia-Pedrajas, M.D., Dez, B.J., Anchieta, A.G., De Jonge, R., Parthasarathy, S., Maruthachalam, K., Atallah, Z.K., Amyotte, S., Paz, Z., Inderbitizin, P., Hayes, R.J., Heiman, D.I., Young, S., Zeng, Q., Engels, R., Galagan, J., Cuomo, C., Dobinson, K.F., Ma, L-J. 2011. Comparative genomics yields insights into niche adaptation of plant vascular wilt pathogens. PLoS Pathogens. 7(7): e1002137.
Developing lettuce with improved quality for processed salads. -
Hayes, R.J., Truco, M.J., Mchale, L.K., Michelmore, R.W., Antonise, R., Hand, P., Simko, I. 2011. Developing lettuce with improved quality for processed salads. Eucarpia Conference on Lettuce and Leafy Vegetables. August 24, 2011, Lille, France.
The inheritance of resistance to Verticillium wilt caused by race 1 isolates of Verticillium dahliae in the lettuce cultivar La Brillante. Reprint Icon -
Hayes, R.J., Mchale, L.K., Vallad, G.E., Jose-Truco, M., Michelmore, R.W., Klosterman, S.J., Maruthachalam, K., Subbarao, K.V. 2011. The inheritance of resistance to Verticillium wilt caused by race 1 isolates of Verticillium dahliae in the lettuce cultivar La Brillante. Theoretical and Applied Genetics. DOI 10.1007/s00122-011-1603-y.
Fifteen years of verticillium wilt of lettuce in america’s salad bowl: a tale of immigration, subjugation and abatement. -
Atallah, Z.K., Hayes, R.J., Subbarao, K.V. 2011. Fifteen years of verticillium wilt of lettuce in america’s salad bowl: a tale of immigration, subjugation and abatement. Plant Disease. DOI:10.1094/PDIS-01-11-0075.
Mapping dominant negative mutation for triforine sensitivity in lettuce and its use as a selectable marker for detecting hybrids. -
Simko, I., Hayes, R.J., Truco, M.J., Michelmore, R.W. 2011. Mapping dominant negative mutation for triforine sensitivity in lettuce and its use as a selectable marker for detecting hybrids. Euphytica. 182(2):157-166.
Iceberg lettuce breeding lines with resistance to Verticillium wilt caused by race 1 isolates of Verticillium dahliae. -
Hayes, R.J., Maruthachalam, K., Vallad, G.E., Klosterman, S.J., Simko, I., Luo, Y., Subbarao, K.V. 2011. Iceberg lettuce breeding lines with resistance to Verticillium wilt caused by race 1 isolates of Verticillium dahliae. HortScience. 46(3):501-504.
Selenium accumulation in lettuce germplasm -
Ramos, S., Rutzke, M., Hayes, R.J., Faquin, V., Guilherme, L.R., Li, L. 2010. Selenium accumulation in lettuce germplasm. Planta. 233:649-660.
Identification of pathogenicity-related genes in the vascular wilt fungus verticillium dahliae by agrobacterium tumefaciens-mediated t-DNA insertional mutagenesis. -
Maruthachalam, K., Klosterman, S.J., Kang, S., Hayes, R.J., Subbarao, K.V. 2011. Identification of pathogenicity-related genes in the vascular wilt fungus verticillium dahliae by agrobacterium tumefaciens-mediated t-DNA insertional mutagenesis. Molecular Biotechnology. PMID:21424547.
Verticillium comparative genomics yields insights into niche adaptation by plant vascular wilt pathogens Reprint Icon -
Klosterman, S.J., Subbarao, K.V., Kang, S., Veronese, P., Gold, S.E., Thomma, B.J., Chen, Z., Henrissat, B., Lee, Y., Park, J., Garcia-Pedrajas, M.D., Barbara, D., Anchieta, A.G., De Jonge, R., Santhanam, P., Maruthachalam, K., Atallah, Z.K., Amyotte, S., Paz, Z., Inderbitzin, P., Hayes, R.J., Heiman, D.I., Young, S., Zeng, Q., Engels, R., Galagan, J., Cuomo, C., Dobinson, K.F., Ma, L. 2011. Verticillium comparative genomics yields insights into niche adaptation by plant vascular wilt pathogens. Plant and Animal Genome Conference. Online.
A single recessive gene conferring short leaves in romaine x Latin type lettuce (Lactuca sativa L.) crosses, and its effect on plant morphology and resistance to lettuce drop caused by Sclerotinia minor Jagger. Reprint Icon -
Hayes, R.J., Wu, B., Subbarao, K.V. 2011. A single recessive gene conferring short leaves in romaine x Latin type lettuce (Lactuca sativa L.) crosses, and its effect on plant morphology and resistance to lettuce drop caused by Sclerotinia minor Jagger. Plant Breeding. 130:388-393.
Molecular variation among isolates of verticillium dahliae and PCR-based differentiation of races. -
Maruthachalam, K., Atallah, Z.K., Vallad, G.E., Klosterman, S.J., Hayes, R.J., Davis, R., Subbarao, K.V. 2010. Molecular variation among isolates of verticillium dahliae and PCR-based differentiation of races. Phytopathology. 100(11):1222-30.
Molecular variation among isolates of verticillium dahliae and PCR-based differentiation of races. -
Maruthachalam, K., Atallah, Z.K., Vallad, G.E., Klosterman, S.J., Hayes, R.J., Davis, M.R., Subbarao, K. 2010. Molecular variation among isolates of verticillium dahliae and PCR-based differentiation of races. Phytopathology. 11:1222-30.
A qPCR assay for detection and quantification of Verticillium dahliae in spinach seed. -
Rauscher, G.M., Mou, B., Hayes, R.J., Koike, S.T., Maruthachalam, K., Subbarao, K.V., Klosterman, S.J. 2010. A qPCR assay for detection and quantification of Verticillium dahliae in spinach seed.. Phytopathology. 100:S107.
SM09A and SM09B: Romaine Lettuce Breeding Lines Resistant to Dieback and with Improved Shelf-life. -
Simko, I., Hayes, R.J., Subbarao, K.V., Sideman, R.G. 2010. SM09A and SM09B: Romaine Lettuce Breeding Lines Resistant to Dieback and with Improved Shelf-life.. HortScience,Year 2010, volume 45, pages 670-672.
Population analyses of the vascular plant pathogen Verticillium dahliae detect recombination and transcontinental gene flow -
Atallah, Z.K., Maruthachalam, K.K., Du Toit, L.J., Koike, S.T., R. Michael, D., Klosterman, S.J., Hayes, R.J., Subbarao, K.V. 2010. Population analyses of the vascular plant pathogen, Verticillium dahliae detect recombination and transcontinental gene flow. Fungal Genetics and Biology. 47:416-422.
Assessment of resistance in lettuce (Lactuca sativa L.) to mycelial and ascospore infection by S.sclerotinia minor Jagger and S. sclerotiorum (Lib.) de Bary -
Hayes, R.J., Wu, B., Pryor, B.M., Subbarao, K.V. Assessment of resistance in lettuce (Lactuca sativa L.) to mycelial and ascospore infection by S.sclerotinia minor Jagger and S. sclerotiorum (Lib.) de Bary. HortScience 45:333-341.
Genetic variation, genotype x environment interaction, and selection for tipburn resistance in lettuce in multi-environments. -
Jenni, S., Hayes, R.J. 2010. Genetic variation, genotype x environment interaction, and selection for tipburn resistance in lettuce in multi-environments.. Euphytica, Feb 2010, Vol 171 (3), pages 427-439.
QTL mapping of resistance to Powdery Mildew in lettuce. Reprint Icon -
Rauscher, G.M., Hayes, R.J., Simko, I. 2009. QTL mapping of resistance to Powdery Mildew in lettuce. Phytopathology 99:S107.
A soilless Verticillium wilt assay using an early flowering lettuce -
Klosterman, S.J., Hayes, R.J. 2009. A soilless Verticillium wilt assay using an early flowering lettuce. Plant Disease. 93:691-698,2009.
Identification of lettuce genes differentially expressed in a Verticillium dahliae-lettuce interaction by suppression subtractive hybridization -
Klosterman, S.J., Anchieta, A.G., Maruthachalam, K., Hayes, R.J., Subbarao, K.V. 2009. Identification of lettuce genes differentially expressed in a Verticillium dahliae-lettuce interaction by suppression subtractive hybridization. Phytopathology Supplement; APSnet (Plant Pathology Online).
Development of rapid pathogenicity assay for Verticillium dahliae using early flowering lettuce. -
Klosterman, S.J., Hayes, R.J. Development of rapid pathogenicity assay for Verticillium dahliae using early flowering lettuce.. Phytopathology.
Population biology of Verticillium dahliae isolates from lettuce in the Sallinas Valley of Californis. -
Phytopathology 98:S14
Genetic Variation for Shelf-life of Salad-cut Lettuce in Modified-atmosphere Environments -
Hayes, R.J., Liu, Y. 2008. Genetic Variation for Shelf-life of Salad-cut Lettuce in Modified-atmosphere Environments. Journal American Society Horticultural Science. 133(2):228-233.
Genetic Diversity of Lettuce (Lactuca sativa) for Resistance to Bacterial Leaf Spot Caused by Xanthomonas campestris pv. vitians. -
Bull, C.T., Goldman, P.H., Hayes, R.J., Madden, L.V., Koike, S.T., Ryder, E.J. 2007. Genetic Diversity of Lettuce (Lactuca sativa) for Resistance to Bacterial Leaf Spot Caused by Xanthomonas campestris pv. vitians. Online:Plant Health Progress DOI:10.1094/PHP-2007-0917-02-RS.
CRISPHEAD BREEDING LINES WITH RESISTANCES TO CORKY ROOT AND LETTUCE MOSAIC -
Mou, B., Hayes, R.J., Ryder, E.J. 2007. Crisphead breeding lines with resistances to corky root and lettuce mosaic. HortScience. 42:701-703.
VARIATION FOR RESISTANCE TO VERTICILLIUM WILT IN LETTUCE (LACTUCA SATIVA L.). -
Hayes, R.J., Vallad, G., Qin, Q., Grube, R., Subbarao, K. 2007. Variation for Resistance to Verticillium Wilt in Lettuce (Lactuca Sativa L.). Plant Disease. 91(4):439-445.
Verticillium wilts and management with special emphasis on lettuce. -
Subbarao, K.V., Vallad, G.E., Hayes, R.J. 2007. Verticillium wilts and management with special emphasis on lettuce. In Eucarpia Leafy Vegetables 2007 Conference Abstracts. University of Warwick, UK, April 2007. pp. 15.
Variation for Big Vein Resistance in Lactuca virosa L. and Introgression of Resistance into Cultivated Lettuce (Lactuca sativa L.). -
Hayes, R.J., Ryder, E.J., Wintermantel, W.M. 2007. Variation for Big Vein Resistance in Lactuca virosa L. and Introgression of Resistance into Cultivated Lettuce (Lactuca sativa L.). In Eucarpia Leafy Vegetables 2007 Conference Abstracts, University of Warwick, UK. pp. 16.
INTROGRESSION OF NOVEL ALLELES FOR PARTIAL RESISTANCE TO BIG VEIN DISEASE FROM LACTUCA VIROSA INTO CULTIVATED LETTUCE -
Hayes, R.J., Ryder, E.J. 2007. Introgression of novel alleles for partial resistance to big vein disease from lactuca virosa into cultivated lettuce. HortScience 42(1):35-39.
CHARACTERIZATION OF RACE-SPECIFIC INTERACTIONS AMONG ISOLATES OF VERTICILLIUM DAHLIAE PATHOGENIC ON LETTUCE -
Vallad, G.E., Qin, Q., Grube, R., Hayes, R.J., Subbarao, K.V. 2006. Characterization of race-specific interactions among isolates of verticillium dahliae pathogenic on lettuce. Phytopathology. 96(12):1380-1387. DOI: 10.1094/PHYTO-96-1380.
THE DEVELOPMENT AND IMPACT OF VERTICILLIUM WILT ON POST-HARVEST QUALITY IN COMMERCIAL LETTUCE FIELDS NATURALLY INFESTED WITH <I>V. DAHLIAE</I> -
Vallad, G., Qin, Q., Hayes, R.J., Subbarao, K.V. 2006. The development and impact of verticillium wilt on post-harvest quality in commercial lettuce fields naturally infested with <i>v. dahliae</i>. Phytopathology.
Host Resistance to Mirafiori Lettuce Big-vein Virus and Virus Sequence Diversity in the Western United States. -
Wintermantel, W.M., Hayes, R.J. 2006. Host Resistance to Mirafiori Lettuce Big-vein Virus and Virus Sequence Diversity in the Western United States.Phytopathology. 96:S124.
RELEASE OF CRISPHEAD LETTUCE GERMPLASM WITH RESISTANCES TO CORKY ROOT AND LETTUCE MOSAIC -
Mou, B., Hayes, R.J., Ryder, E.J. 2006. Release of crisphead lettuce germplasm with resistances to corky root and lettuce mosaic. Germplasm Release. Release of seven breeding lines of crisphead lettuce (Lactuca sativa L.) U.S. Dept. of Agriculture. Agri. Research Service.
HOST RESISTANCE TO MIRAFIORI LETTUCE BIG-VEIN VIRUS AND LETTUCE BIG-VEIN ASSOCIATED VIRUS AND VIRUS SEQUENCE DIVERSITY AND FREQUENCY IN CALIFORNIA -
Hayes, R.J., Wintermantel, W.M., Nicely, P.A., Ryder, E.J. Host resistance to Mirafiori lettuce big-vein virus and Lettuce big-vein associated virus and virus sequence diversity and frequency in California. Plant Disease 90:233-239. 2006.
VARIATION IN HOST RESPONSES AMONG SELECT LETTUCE CULTIVARS TOWARDS DIVERSE ISOLATES OF V. DAHLIAE AND V. ALBO-ATRUM. -
Vallad, G.E., Qin, Q.M., Grube, R., Hayes, R.J., Subbarao, K.V. 2005. Variation in host responses among select lettuce cultivars towards diverse isolates of v. dahliae and v. albo-atrum. Phytopathology. v. 95. pg S106.
DEVELOPMENT OF LETTUCE BREEDING LINES RESISTANT TO BATERIAL LEAF SPOT -
Hayes, R.J., Bull, C.T., Goldman, P.H., Ryder, E.J. 2005. Development of lettuce breeding lines resistant to baterial leaf spot. Hortscience. v. 40. p. 1098.
IDENTIFIED RESISTANCE IN LETTUCE GERMPLASM TO VERTICILLIUM WILT CAUSED BY VERTICILLIUM DAHLIAE -
Vallad, G.E., Qin, Q.M., Grube, R., Hayes, R.J., Ryder, E.J., Subbarao, K.V. 2005. Identified resistance in lettuce germplasm to verticillium wilt caused by verticillium dahliae. Hortscience. v. 40. p. 1109.
VARIATION FOR TIPBURN RESISTANCE IN LETTUCE -
Hayes, R.J. 2006. Variation for tipburn resistance in lettuce. HortScience 40:990-991.
MIRAFIORI LETTUCE VIRUS (MILV) AND LETTUCE BIG VEIN VIRUS (LBVV) SEQUENCE DIVERSITY AND FREQUENCY IN CALIFORNIA AND ARIZONA LETTUCE, AND ANALYSIS OF BIG VEIN RESISTANCE -
Wintermantel, W.M., Hayes, R.J., Nicely, P.A., Ryder, E.J. 2005. Mirafiori lettuce virus (MiLV) and Lettuce Big Vein Virus (LBVV) sequence diversity and frequency in California and Arizona lettuce, and analysis of big vein resistance. Joint Conference of the International Working Groups on Legume and Vegetable Viruses Proceedings. p. 44.
UNILATERAL AND BILATERAL HYBRIDIZATION BARRIERS IN INTER-SERIES CROSSES OF 4X 2EBN SOLANUM STOLONIFERUM, S. PINNATISECTUM, S. CARDIOPHYLLUM AND 2X 2EBN S. TUBEROSUM HAPLOIDS AND HAPLOID-SPECIES HYBRIDS. -
Hayes, R.J., Dinu, I.I., Thill, C.A. 2005. Unilateral and bilateral hybridization barriers in inter-series crosses of 4x 2ebn solanum stoloniferum, s. pinnatisectum, s. cardiophyllum and 2x 2ebn s. tuberosum haploids and haploid-species hybrids. Sexual Plant Reproduction. v. 17. p. 303-311.
NOVEL INTER-SERIES HYBRIDS IN THE GENUS SOLANUM. -
INTROGRESSION OF BIG VEIN TOLERANCE FROM LACTUCA VIROSA L. INTO CULTIVATED LETTUCE (LACTUCA SATIVA L.). -
Hayes, R.J., Ryder, E.J., Robinson, B.J. Introgression of big vein tolerance from lactuca virosa L. into cultivated lettuce (lactuca sativa L.) Hortscience. 2004. v. 39(4). p. 881.
BREEDING LETTUCE CULTIVARS WITH HIGH RESISTANCE TO LETTUCE MOSIAC VIRUS. -
Hayes, R.J., Ryder, E.J. Breeding lettuce cultivars with high resistance to lettuce mosiac virus. Lettuce Workshop and Leafy Vegetable International Conference Proceedings. 2004. No page numbers.