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

release early-generation (F 2 to F 4 ) populations genetically fixed for disease resistance but with sufficient variability for leaf characters to encompass two or more lettuce types used in baby leaf production. External breeding programs could then

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Joseph L. Smilanick

Postharvest Pathogens and Disease Management . 2005. P. Narayanasamy. John Wiley, Somerset, NJ. 578 pages. $135.00. Hardcover. ISBN: 978-0-471-74303-3 Postharvest diseases are responsible for the spoilage of durable and fresh perishable

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Allen V. Barker

Mineral Nutrition and Plant Disease. Lawrence E. Datnoff, Wade H. Elmer, and Don M. Huber (editors). 2007. APS Press, St. Paul, MN. 278 pages. $89.00 Hardcover. ISBN 978-0-89054-346-7. This book covers the relationship of mineral nutrients

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E. Vanessa Campoverde, Georgina Sanahuja, and Aaron J. Palmateer

of disease are not acceptable, since they are grown primarily for aesthetics and high market quality standards. The environmental conditions that typically favor nursery production can also affect the quality and health of plant products. For instance

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Mark A. Bennett, Nancy W. Callan, and Vincent A. Fritz

Disease management is an important step in any crop establishment system. Emergence of field-seeded crops may take several weeks for many species and represents a vulnerable stage of plant growth. This paper considers various biological, chemical, and physical seed treatments for improved seed performance. The role of seed quality and cultural practices in seedling establishment also is reviewed. Multidisciplinary approaches to improving horticultural crop establishment are promising.

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Dario J. Chavez, Eileen A. Kabelka, and José X. Chaparro

. lundelliana Bailey and C. okeechobeensis ssp. okeechobeensis Bailey, have been recently studied as useful sources for disease resistance such as powdery mildew and P. capsici crown rot resistance ( Cohen et al., 2003 ; Contin and Munger, 1977

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Kent E. Cushman, William B. Evans, David M. Ingram, Patrick D. Gerard, R. Allen Straw, Craig H. Canaday, Jim E. Wyatt, and Michael M. Kenty

Many areas of the United States produce cucurbits ( Cucurbita spp.) for local and regional consumption. In the southeastern United States, weather is often conducive to the development of fungal diseases and subsequent yield loss. Two of the most

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Michael C. Long, Stephen L. Krebs, and Stan C. Hokanson

Powdery mildew (PM) is a common foliar disease of genus Rhododendron ( Basden and Helfer, 1995 ; Coyier, 1986 ; Kenyon, 1995 ). Although PM is known to cross-infect broad taxonomic groups within the genus ( Beales, 1997 ; Galle, 1987

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G.R. McEachern, Jim Kamas, Doug Cook, and Jerral Johnson

Since 1977, it was believed the grape strain of Xylella fastidiosa, Pierce's Disease (PD), was limited to sites receiving less than 800 hours of winter chilling below 45 °F. Warm winters since 1992–93 resulted in numerous PD-positive vineyards in central Texas which were previously nonaffected. Vine mortality ranges from minimal to over 80% dead vines. A Davis Mountains site receiving over 1,000 hours was also severely infected in 1996. The last severe winter in Texas was 1989–90; therefore, warm winters could be contributing. This climatic change could have affected vines, vectors, bacteria, and/or hosts. Recent work based on a study of 20 PD samples, 11 from Texas and 9 from other states, including California and Florida, indicates that the samples of PD grape strain of Xylella fastidiosa are clonally related. ELISA tests failed to identify PD from 1994–96; therefore, a sensitive REP-PCR test is needed before vine, bacteria, vector, and host management strategies can be developed.

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E. Fava, D. Janik, C. Madramootoo, and K.A. Stewart

31 ORAL SESSION 4 (Abstr. 024–033) Crop Production–Diseases and Insects