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visual quality rankings, good survival, and limited or lacking fruit production of ‘Gulf Stream’, ‘Jaytee’, and ‘Harbour Dwarf’ warranting wider landscape use of these selections in the Florida landscape. The overall objective of this study was to

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main strategies have been used in fruit breeding programs to overcome these difficulties: 1) the development of early selection criteria to eliminate genotypes with a long juvenile period and 2) the shortening of this period by means of forced growth of

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that are capable of performing well in challenging urban sites, thus making site-specific selection of shrubs absolutely crucial. There is currently a lack of quantitative assessments of stress tolerance in a large proportion of available species and

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Abstract

Man's breeding and selection of woody ornamentals is, by no stretch of the imagination, a novel pursuit, but has employed succeeding generations of plantsmen for many centuries. Currently, selection of woody ornamentals that depends on government or industry funding is inevitably stimulated by cultural or disease problems with existing species or cultivars, by changing consumer needs, or by recognition of a market demand for superior or novel plants. The worth of this work frequently is judged in terms of its potential economic benefit. Speculative breeding and/or selection of esoteric plants, a traditional pursuit of the enthusiastic horticulturist, is now difficult for anyone other than the keen amateur to sustain.

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factors could be minimized and the results would be more broadly applicable. Our first screening project involved primarily common rootstocks and other citrus selections ( Castle and Manthey, 1998 ). The selections ranked in terms of Fe 3+ reduction rates

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both Perovskia selections. Growth data were analyzed to determine lower and upper nutritional limits for each taxa. Plants of both Perovskia selections fertilized with 50 and 75 mg·L −1 N resulted in similar and significantly smaller plants than

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hobbyists ( Peterson, 1986 , 1991 ). Currently, over 45 cultivars are available from nurseries ( Pomper et al., 2009a ), and many of these selections are maintained at the Kentucky State University (KSU) National Clonal Germplasm Repository (NCGR) for

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Abstract

A 10-year analysis of the high-density nursery (HDN) in the breeding of low-chilling peach and nectarine [Prunus persica (L.) Batsch] cultivars indicated selection was effective during the first cropping year for chilling requirement, fruit development period, size, color, shape and firmness but not for crop load, which needs to be evaluated at normal spacing over several years. The HDN system effectively has advanced the breeding program by promoting short generation time, reducing labor and space, and allowing for rating of some characters within 2 years from seed.

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Abstract

Evaluation of the progeny populations from crosses between a resistant sweet corn inbred (Zea mays L.) and 3 susceptible inbreds indicated that the variation for partial resistance to corn leaf rust (Puccinia sorghi Schw.) depended on the parents used. Heritability estimates were high with both additive and dominance gene effects important in character expression. Epistasis was shown to influence rust reaction in at least one cross. The ability to improve partial resistance in 2 sweet corn populations was demonstrated by 3 methods of selection.

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Since the 1980s, there has been consistent progress in breeding and selection of cold-hardy, disease-resistant grape cultivars that are adapted to the cool, humid climates of the eastern and central United States. Many of these cultivars are based

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