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Xue-qin Wang, Yuan Huang, and Chun-lin Long

The genus Rhododendron includes widely distributed flowering plants found throughout the world with the exception of Africa and South America and contains over 1000 species ( Chamberlain et al., 1996 ). Centers with highest diversity and

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Stephen L. Krebs and Michael D. Wilson

Bruce Briggs for supplying hundreds of micropropagated rhododendrons. Anne Dorrance generously provided fresh cultures of P. cinnamomi and reviewed an earlier draft of this paper. Don Whitney assisted with the greenhouse work.

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Tongyin Li, Guihong Bi, Richard L. Harkess, and Eugene K. Blythe

). Higher N fertilization rate promoted shoot growth of container-grown Rhododendron L. ‘Karen’ and increased nutrient leaching, whereas decreased N and P promoted root growth and improved nutrient uptake efficiency ( Ristvey et al., 2007 ). Intermediate N

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Tongyin Li, Guihong Bi, and Richard L. Harkess

have a lower growth rate compared with Rhododendron L. ‘P.J.M.’ and Rhododendron ‘Cannon’s Double’ used in the study by Bi et al. (2007a) ; and 2) a greater N rate of 15 m m instead of 10 m m was applied to azalea plants in our study, resulting

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Thomas G. Ranney, Frank A. Blazich, and Stuart L. Warren

The research was funded in part by the North Carolina Agricultural Research Service (NCARS) and the Research Foundation of the American Rhododendron Society. Use of trade names in this publication does not imp] y endorsement by the NCARS of products

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Mark H. Brand and Richard Kiyomoto

Storrs Agricultural Experiment Station scientific contribution 1834. This work was supported in part by funds made available through the Holden Arboretum, Mentor, Ohio, and the Connecticut Chapter of the American Rhododendron Society. The

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Jessica D. Lubell and Mark H. Brand

Elepidote rhododendrons are important landscape plants because of showy flowers and bold evergreen foliage. The most common flower colors are lavender, pink, and white, but red flower color is highly sought after. Only some elepidote rhododendrons

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Ryan N. Contreras, Thomas G. Ranney, and Shyamalrau P. Tallury

Rhododendrons and azaleas ( Rhododendron L.) are among the most widely grown ornamental plants in the world. There are over 1000 species recognized in eight subgenera ( Chamberlain et al., 1996 ). Species within subgenera readily hybridize and

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S.L. Krebs

Root rot caused by the soil-borne pathogen Phytophthora cinnamomi is one of the deadliest and most costly diseases in rhododendron culture. Unfortunately, the majority of cultivars appear to be susceptible to this fungus. Host resistance does occur, but it represents a tolerance of rather than immunity from the disease. A breeding program has been initiated to develop a broader array of root rot resistant cultivars and to determine the genetic basis for resistance. Greenhouse inoculations and screenings of 48 contemporary cultivars yielded seven clones with moderate to high levels of resistance to P. cinnamomi. Protocols for evaluation at the seedling stage were developed in order to screen large breeding populations of about 200 seedlings per cross. Root rot tolerance appears to have low-moderate heritability in these rhododendron populations. Groups of progeny with one resistant parent had a slower mortality rate and higher survivorship (avg. 10%) after 2 months of disease pressure than crosses in which both parents were susceptible (0 survivorship). A recurrent selection strategy is planned to increase the frequency of alleles for resistance in breeding populations of rhododendrons.

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Jenna Sicuranza and Nathaniel A. Mitkowski

host such as Rhododendron catawbiense (Michx.) and be inadvertently transported across country ( Englander and Tooley, 2003 ). Because Rhododendron L. is traditionally propagated clonally by cuttings, infected material could then be unintentionally