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United States Department of Agriculture

Agricultural Research Service

Related Topics

Ryan Hayes
Crop Improvement and Protection Research
Research Geneticist

Phone: (831) 755-2834
Fax: (831) 755-2814
1636 E. ALISAL ST.
SALINAS, CA, 93905

Projects
Breeding and Genetics of Lettuce for Resistance Against Race 2 Verticillium Wilt
General Cooperative Agreement (A)
  Accession Number: 426231
Genetic Enhancement of Lettuce, Spinach, Melon, and Related Species
Appropriated (D)
  Accession Number: 424945
Breeding and Genetics of Lettuce for Resistance Against Race 2 Verticillium Wilt
Interagency Reimbursable Agreement (I)
  Accession Number: 425678
Development of Slow-Bolting Iceberg and Romaine Cultivars for Desert Production Areas
Reimbursable (R)
  Accession Number: 426062
Screening of Lettuce Germplasm for Resistance to Wilt Caused by Verticillium Dahliae
Specific Cooperative Agreement (S)
  Accession Number: 423856
Lettuce Breeding and Genetics
Trust (T)
  Accession Number: 426665

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Characterization and performance of 16 new inbred lines of lettuce - (Peer Reviewed Journal)
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 - (Germplasm Registration)
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) - (Proceedings)
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 - (Peer Reviewed Journal)
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 - (Book / Chapter)
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 - (Peer Reviewed Journal)
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 - (Abstract Only)
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 - (Peer Reviewed Journal)
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 - (Peer Reviewed Journal)
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.). - (Peer Reviewed Journal)
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. - (Abstract Only)
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. - (Abstract Only)
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 - (Abstract Only)
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) - (Peer Reviewed Journal)
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 - (Peer Reviewed Journal)
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. - (Abstract Only)
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 - (Peer Reviewed Journal)
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. - (Peer Reviewed Journal)
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. - (Peer Reviewed Journal)
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. - (Peer Reviewed Journal)
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 - (Peer Reviewed Journal)
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. - (Peer Reviewed Journal)
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 - (Abstract Only)
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 - (Peer Reviewed Journal)
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. - (Peer Reviewed Journal)
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. - (Peer Reviewed Journal)
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. - (Abstract Only)
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. - (Peer Reviewed Journal)
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 - (Peer Reviewed Journal)
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 - (Peer Reviewed Journal)
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. - (Peer Reviewed Journal)
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 - (Abstract Only)
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 - (Peer Reviewed Journal)
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 - (Abstract Only)
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. - (Abstract Only)
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. - (Abstract Only)
Phytopathology 98:S14
Genetic Variation for Shelf-life of Salad-cut Lettuce in Modified-atmosphere Environments - (Peer Reviewed Journal)
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. - (Peer Reviewed Journal)
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 - (Peer Reviewed Journal)
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.). - (Peer Reviewed Journal)
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.
Variation for Big Vein Resistance in Lactuca virosa L. and Introgression of Resistance into Cultivated Lettuce (Lactuca sativa L.). - (Abstract Only)
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.
Verticillium wilts and management with special emphasis on lettuce. - (Abstract Only)
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.
Introgression of Novel Alleles for Partial Resistance to Big Vein Disease from Lactuca Virosa into Cultivated Lettuce - (Peer Reviewed Journal)
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 - (Peer Reviewed Journal)
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 v. Dahliae - (Abstract Only)
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 v. dahliae. Phytopathology.
Host Resistance to Mirafiori Lettuce Big-vein Virus and Virus Sequence Diversity in the Western United States. - (Abstract Only)
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 - (Germplasm Release)
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 - (Peer Reviewed Journal)
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. - (Abstract Only)
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 - (Abstract Only)
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 - (Abstract Only)
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 - (Abstract Only)
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 - (Abstract Only)
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. - (Peer Reviewed Journal)
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. - (Peer Reviewed Journal) - (25-Jul-04)
Introgression of Big Vein Tolerance from Lactuca Virosa L. into Cultivated Lettuce (Lactuca Sativa L.). - (Proceedings)
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. - (Abstract Only)
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.
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Last Modified: 10/30/2014
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