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Stephen R. King, Angela R. Davis, Wenge Liu and Amnon Levi

controlling the disease ( Driver and Louws, 2002 ). Actigard (acibenzolar-s-methyl; Syngenta Crop Protection, Greensboro, NC) has shown to be effective, but only when inoculum densities are low ( Anith et al., 2004 ). Host plant resistance in tomato is

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Joseph Postman, Gayle Volk and Herb Aldwinckle

Correlation of plant DNA sequence data with disease resistance data, with the goal of discovering genetic markers for valuable genes, is dependent on the existence of plant populations with known disease resistance. Segregating populations

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Wenjing Guan, Xin Zhao, Richard Hassell and Judy Thies

pathotypes. Some important disease resistance mechanisms were mentioned, whereas systematic discussion of this topic was rather limited. Unlike previous work, the current review explores specifically the defense mechanisms in grafted vegetable plants and

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Beiquan Mou, Steven T. Koike and Lindsey J. du Toit

differences in disease severity among the cultivars. An additional series of spinach cultivars, including some with resistance to race 5 and race 6 of the downy mildew pathogen, were also susceptible to Stemphylium leaf spot ( Koike et al., 2001b ). In lettuce

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Kendra Baumgartner, Phillip Fujiyoshi, Greg T. Browne, Chuck Leslie and Daniel A. Kluepfel

Phytophthora species, and more tolerant of soil salinity than J. regia ( McGranahan and Catlin, 1987 ). Despite its widespread use, the resistance of Paradox rootstock to Armillaria root disease, crown gall, and Phytophthora crown and root rot is

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Shawn A. Mehlenbacher

55 COLLOQUIUM 2 (Abstr. 995-999) Classical and Molecular Approaches to Breeding Horticultural Plants for Disease Resistance

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Annelle W.B. Holder, Winston Elibox, Christopher Avey and Pathmanathan Umaharan

was to identify potential sources of resistance to A. anthurii under natural epiphytotics and understand disease progression among six anthurium genotypes grown by anthurium farmers in Trinidad. Materials and Methods The experiment was conducted in a

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Qianni Dong, Xinwang Wang, David H. Byrne and Kevin Ong

disease resistance to black spot have been characterized in roses. Vertical or complete resistance, which blocks sporulation and severely restricts the mycelial growth of the pathogen, is usually controlled by major dominant genes ( Rdr or Rosa disease

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Jason Cavatorta, George Moriarty, Mark Henning, Michael Glos, Mary Kreitinger, Henry M. Munger and Molly Jahn

., 2002 ), the elevated levels of disease resistances combined with improved color and quality have long made this open-pollinated cultivar a standard slicing cucumber. Decades of cucumber breeding efforts at Cornell have continued to focus on resistance

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Gayle M. Volk, Christopher M. Richards, Ann A. Reilley, Adam D. Henk, Patrick A. Reeves, Philip L. Forsline and Herb S. Aldwinckle

particularly damaging to apple crops. Some resistant cultivars are available to breeding programs, but additional sources of resistance are desirable. Phenotypic screening is the primary source of disease resistance data for Malus collections, but specific