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B.J. Weir, R.G. St. Pierre and R.N. Chibbar

Randomly amplified polymorphic DNA (RAPD) markers were used to distinguish among 16 cultivars of saskatoon (Amelanchier spp.). Eight 9-base, oligonucleotide primers amplified a total of 98 DNA fragments, of which 29 were useful as reproducible polymorphic markers. Twelve cultivars and two pairs of cultivars were uniquely characterized by these 29 markers. Polymorphism was not detected among five sources of the cv. Thiessen, whereas variability was found among seedlings from self-pollinated `Thiessen'. Samples of the cvs. Regent and Parkhill were indistinguishable from one of two sources, suggesting that the cultivars were mislabelled.

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Hannah M. Mathers and Michele M. Bigger

Many nurseries within Ohio and northeastern, southeastern, and western United States, and Canada have reported severe bark splitting and scald-type problems in 2005. The amount and severity of damage seen in 2005 has been unlike anything seen before. At Ohio State University, samples from across the state started appearing in 2003–04 and increased in incidence in 2005. Growers' reports of exceeding losses of 5% of their inventory or 3000 to 4000 trees per nursery are not uncommon. At an average cost of $125 per tree and with the number of nurseries reporting problems, the stock losses in Ohio have been staggering, in excess of several million dollars. The trees that we have seen problems on in 2005 have been callery pears, yoshino cherry, kwanzan cherry, crab apples, sycamore, serviceberry, hawthorn, mountain ash, black gum, paper bark maple, japanese maples, norway maple `Emerald Queen', red maples, kousa dogwood, magnolia `Elizabeth' and the yellow magnolias such as `Butterflies', `Sawada's Cream', `Yellow Bird', and `Yellow Lantern'. It has long been observed that the actual cause of a bark crack was “preset” by a wound such as the improper removal of a basal sprout, herbicide, leaving of a branch stub, or lack of cold hardiness. Cold and frost may be contributing to the increase in bark splitting across the United States; however, new research results at Ohio State University regarding the effects of DNA preemergent herbicides in the reduction of root hardiness and regrowth potential, sprout removal and other mechanical injuries, and postemergent herbicide application will reveal these are more the causal agents.

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Raquel Enedina Medina-Carrillo, Samuel Salazar-García, Jorge Armando Bonilla-Cárdenas, Juan Antonio Herrera-González, Martha Elva Ibarra-Estrada and Arturo Álvarez-Bravo

in Mexican serviceberry [ Malacomeles denticulata (Kunth) Jones] fruit where PCs decreased during maturation ( Herrera-Hernández et al., 2013 ). In persimmon ( Diopyros kaki Thunb.) fruit, the carotenoid concentration decreased during the first

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Peter J. Leonard, Mark H. Brand, Bryan A. Connolly and Samuel G. Obae

Sorbus (mountain ash), Malus Mill. (apple), Pyrus L. (pear), Amelanchier Med. (serviceberry), Crataegus L. (hawthorn), and several other woody plants with pomes or apple-like fruits ( Campbell et al., 2007 ). Hybridization between species within

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Julia A. Cartabiano and Jessica D. Lubell

(Bartr.), and Viburnum acerifolium (L.). These native shrubs have the potential to become revenue-generating crops for the nursery industry if successful propagation protocols are developed. For example, Amelanchier laevis (alleghany serviceberry) is

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Bryan J. Peterson, Gregory J.R. Melcher, Ailish K. Scott, Rebecca A. Tkacs and Andrew J. Chase

as species of serviceberry ( Amelanchier sp.), which may be propagated from softwood cuttings but are famously recalcitrant once terminal buds have set ( Still and Zanon, 1991 ). Species also may respond differently to environmental factors like the

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Donita L. Bryan, Michael A. Arnold, Astrid Volder, W. Todd Watson, Leonardo Lombardini, John J. Sloan, Luis A. Valdez-Aguilar and Andrew D. Cartmill

Flame’ and ‘Brandywine’), serviceberry [ Amelanchier arborea (F. Michx.) Fernald × A. grandiflora (Mich. F.) Fern.], and zelkova [ Zelkova serrata (Thunb.) Mak. ‘Green Vase’] were unaffected (height and caliper) when planted 10.2 or 15.2 cm deep in