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Yunwen Wang, Huangjun Lu, Richard N. Raid, Gregg S. Nuessly, and Georgy Faroutine

even higher resistance can be developed by combining the resistant gene(s) on chromosomes 2 and 4 into a single cultivar background. Literature Cited Barak, J.D. Gilbertson, R.L. 2003 Genetic diversity of Xanthomonas campestris pv. vitians , the

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Ryan J. Hayes, Mark A. Trent, Beiquan Mou, Ivan Simko, Samantha J. Gebben, and Carolee T. Bull

many lettuce pests, including leafminers ( Liriomyza langei ), downy mildew ( Bremia lactucae ), and bacterial leaf spot (BLS). Bacterial leaf spot of lettuce, caused by Xanthomonas campestris pv. vitians ( Xcv ), is an increasingly damaging disease

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Huangjun Lu and Richard Raid

Bacterial leaf spot of lettuce ( Lactuca sativa L.), caused by Xanthomonas campestris pv. vitians , is an economically important disease of lettuce in the world ( Barak et al., 2001 ; Patterson et al., 1986 ; Pennisi and Pane, 1990 ; Sahin

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Ryan J. Hayes, Carolee T. Bull, Polly H. Goldman, and Edward J. Ryder

Bacterial leaf spot of lettuce caused by Xanthomonas campestris pv. vitians (Xcv) is an important lettuce disease in California. No adequate control measures have been found, although resistance exists in several heirloom cultivars. Deployment of cultivars resistant to bacterial leaf spot will reduce these periodic and costly disease events. The objectives of this research were to 1) identify new sources of resistance within modern crisphead cultivars and 2) select for resistance in `Salad Crisp' × `Iceberg' progeny. Field plots were established and grown with overhead irrigation, and a three-strain mixture of Xcv was applied until runoff 1 week after thinning at 1 × 109 CFU/mL. Twenty-six crisphead cultivars were tested in unreplicated field trials and rated on a 1 (susceptible) to 4 (resistant) scale. Selection was carried out between and within families from the F2 to F4 generation. Sixteen F3 families were evaluated in unreplicated plots, and 12 F5 families were tested in replicated plots for disease incidence and severity. No usable levels of resistance were identified in the modern crisphead cultivars tested to date. All F3 families had resistance greater than `Iceberg', and 19 plants from eight families were selected for further breeding. Subsequently, 12 plants from two F4 families were selected. Replicated trials of 12 F5 families indicated that all lines have disease severity comparable to both parents. Breeding lines from crosses to `Salinas 88' are currently being developed.

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Ivan Simko, Ryan J. Hayes, Carolee T. Bull, Beiquan Mou, Yaguang Luo, Mark A. Trent, Amy J. Atallah, Edward J. Ryder, and Rebecca G. Sideman

.L. 2003 Genetic diversity of Xanthomonas campestris pv. vitians , the causal agent of bacterial leafspot of lettuce Phytopathology 93 596 603 Bull, C.T. Goldman, P.H. Hayes, R.J. Madden, L.V. Koike, S.T. Ryder, E.J. 2007 Genetic diversity of lettuce for

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Andrew Sherwood, Lisa W. Alexander, Matthew D. Clark, Steve McNamara, and Stan C. Hokanson

diverse populations with resistance to bacterial leaf spot caused by Xanthomonas campestris pv. vitians HortScience 49 18 24 Hurme, P. Repo, T. Savolainen, O. Pääkkönen, T. 1997 Climatic adaptation of bud set and frost hardiness in Scots

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Ryan J. Hayes, German Sandoya, Beiquan Mou, Ivan Simko, and Krishna V. Subbarao

.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 Mou, B. Bull, C. 2004 Screening lettuce germplasm for new sources of

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Ryan J. Hayes, Carlos H. Galeano, Yaguang Luo, Rudie Antonise, and Ivan Simko

by Xanthomonas campestris pv. vitians ), and a number of Tombusvirus -resistant romaine accessions ( Bull et al., 2007 ; Hayes et al., 2011a , 2013 ; Hayes and Liu, 2008 ; Simko et al., 2012 ). The cultivar La Brillante has demonstrated twice

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Charlene M. Grahn, Chris Benedict, Tom Thornton, and Carol Miles

lettuce germplasm enhancement: Developing diverse populations with resistance to bacterial leaf spot caused by Xanthomonas campestris pv. vitians HortScience 49 18 24 Hoque, M.M. Ajwa, H. Othman, M. Smith, R. Cahn, M. 2010 Yield and postharvest quality