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A. James Downer, Janice Y. Uchida, Donald R. Hodel, and Monica L. Elliott

be observed on longitudinal or transverse cuts of petioles or the rachis of a symptomatic leaf. Vascular discoloration is light brown to red brown or bright pink ( Feather et al., 1979 ; Simone 2004a ). The pink discoloration is vibrant and striking

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Xiao-Juan Wei, Xiao-Jing Liang, Jin-Lin Ma, Kai-Xiang Li, and Haiying Liang

living symbol of elegance and aristocracy, novel cultivars with variations in flower colors, shapes and fragrance, bloom sizes and timing, growth habits, and disease resistance are constantly sought after by amateur and commercial camellia growers

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Shahrokh Khanizadeh, Yvon Groleau, Odile Carisse, Vicky Toussaint, Raymond Granger, and Gilles Rousselle

freedom from root suckers compared with ‘M.9’ ( Table 1 ), superior hardiness ( Khanizadeh et al., 2000 ), ease of propagation, and better yield efficiency ( Table 2 ). Table 1. Burr knots, sucker number, trunk cross-sectional area (TCSA), height

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Fazeeda N. Hosein, Adrian M. Lennon, and Pathmanathan Umaharan

, Agrobacterium strains, and explants types (etiolated internodes, root section, calli) ( Chen and Kuehnle, 1996 ; Chen et al., 1997 ; Fitch et al., 2011 ; Kuehnle and Chen, 1994 ; Kuehnle et al., 2001 , 2004 ; Zhao et al., 2010 ) with reported

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Margaret R. Pooler

.S. National Arboretum has an ongoing breeding program aimed at developing new cultivars of ornamental cherry with disease and pest resistance, tolerance to environmental stresses, and superior ornamental characteristics. Breeding strategies include broadening

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Claude Richer, Caroline Lafond, and Campbell Davidson

and the French language. Leclerc lived in Île d'Orléans (Quebec) and died on 9 Aug. 1988. Rosa ‘Félix Leclerc’ was selected based on its plant growth habit, hardiness, disease resistance, flower size, flower color, and length of flowering season

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Cecil Pounders, Brian E. Scheffler, and Timothy A. Rinehart

released more than 30 cultivars over the past 50 years, have focused on crapemyrtle resistance to diseases such as powdery mildew ( Erysiphe lagerstroemiae E. West) and combinations of other desirable horticultural traits ( Pooler, 2006 ; Pooler and Dix

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Guochen K. Png, Katherine S. Downes, and Beng H. Tan

adventitious roots on stem cuttings readily, which hinders propagation ( Dawson and King, 1994 ). Auxins are used in vegetative propagation to stimulate adventitious root growth. Because the ratios of endogenous plant growth regulators vary between different

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Keun H. Cho, Veronica Y. Laux, Nathan Wallace-Springer, David G. Clark, Kevin M. Folta, and Thomas A. Colquhoun

(colors, volatiles, growth rates, yields, or disease resistances) from selected species or cultivars ( Bellini et al., 2014 ; Daud et al., 2013 ). Environmental factors such as adequate mist interval, relative humidity, temperature, light, and ambient air

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Ksenija Gasic and John E. Preece

to peach rootstocks; little or no rootstock suckering; tolerant of calcareous soils and asphyxia; moderate resistance to root-knot nematode ( Meloidogyne spp. ); resistant to lesion nematode populations ( Pratylenchus vulnus ); resistant to