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Ralph Scorza, G.W. Lightner, and A. Liverani

Abstract

Branch growth of compact (CT) and “Pillar” (PI) peach [Prunus persica (L.) Batsch.], a columnar growth type, and progeny of CT × PI was analyzed. PI trees were distinguished from CT trees by narrower branch angles and relatively fewer and longer branches. CT × PI hybridization produced two distinct classes of trees in a 1:1 ratio—globe shape (GL) and upright (UP). GL trees had a large number of branches, resembling CT trees, but had narrower branch angles. UP trees resembled PI trees, but with wider branch angles. Analysis of seedling growth at 1, 2, and 3 months indicated that height and number of lateral branches could be used to classify UP and GL mature tree form. Branch angle measured at 2 months was important in distinguishing GL from CT seedlings. Such measurements on young seedlings may be used for early selection of growth habit. The reported results indicate that peach tree form, in respect to branching density and branch angle, can be readily manipulated through hybridization of the appropriate growth types. The columnar form of the PI tree suggests its potential for high-density production systems and its use as a parent in developing narrow canopied trees.

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Phillip A. Wadl, Mark T. Windham, Richard Evans, and Robert N. Trigiano

Witte et al. (1996) . These trees were also visually rated for powdery mildew resistance and those that were susceptible to the disease were removed. Description ‘Empire’ is a brilliant, white-bracted kousa dogwood that has a columnar form (10.1 m tall

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D. Creech and Yin Yunlong

There are three botanical varieties associated with the genus Taxodium: 1) Baldcypress (BC) = Taxodium distichum (L.) Rich.var. distichum, 2) Pondcypress (PC) = T. distichum var. imbricarium (Nutt.) Croom and 3) Montezuma cypress (MC) = T. distichum var. mexicana Gordon. Taxodium hybridization promises to combine the best characteristics of superior parents. In 1988, clones T302 (a BC × MC F1 hybrid), T401 (PC × MC), and T202 (PC × BC) were selected in China primarily for growth rate and tolerance to alkaline and salt-rich coastal floodplains. T302 is recommended in China for soils with pH 8.0∼8.5 and salt concentrations <0.2%. Other attributes of T302 included 159% faster growth than BC, good columnar form, longer foliage retention in fall and early winter, and no knees. T302 has been in the USA since January 2002 and is currently under evaluation in over 30 locations in southern USA. The clone was named `Nanjing Beauty' in 2004 as a cooperative introduction of the SFA Mast Arboretum and Nanjing Botanical Garden. In March 2005, the SFA Mast Arboretum received two new clones from China. T140 and T27 are considered more evergreen than T302 and both demonstrate strong salt tolerance. The clones were selected from a field population of T302 × TM—with strong TM characteristics and improvements in growth rate, salt tolerance, form and vigor. T140 grows faster than T27, which produces a wider profile. The foundation of the most recent selections comes originally from crosses made by Professor Chen and Liu in 1992 at the Nanjing Botanical Garden. Pollen from TM was applied to a female T302 and fifteen selections were made in 1995. The main characteristics for selection were 1) fast growth rate, 2) dark green color during the growing season and a red-orange leaf color in the fall, and 3) evergreen leaves. In 2006 or 2007, the results from T140 and T27 will be reported and registered with the Chinese Forestry Department. It will be at least five years before T140 and T27 enter commerce. In June, 2005 there were <100 each of these two clones. T118, T120 and T149 have already been registered with the Chinese Forestry Department at the provincial level, while T302 has been registered at the national level.

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Dongyan Hu and Ralph Scorza

potential of ‘A72’ as an ornamental, particularly combined with the columnar form. We found a wide range of tree sizes from these crosses with unique columnar forms. Dwarf trees ( nn ) with smaller leaves than brachytic dwarf ( dwdw ) trees present new

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Phillip A. Wadl, John A. Skinner, John R. Dunlap, Sandra M. Reed, Timothy A. Rinehart, Vincent R. Pantalone, and Robert N. Trigiano

has small white bracts, red fall color, and columnar form. Breeding line PHK 6 has large white fused bracts, exfoliating bark, and a spreading form. Breeding line PHK 8 has spade-shaped white bracts with slight green pigmentation, exfoliating bark, and

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Melody Reed Richards, Larry A. Rupp, Roger Kjelgren, and V. Philip Rasmussen

distinct columnar form with multiple leaders. The tree measured 35 ft tall and had a crown width of 12 ft. Tree 1034 had a strong central leader with a height of 58 ft and crown width of 26 ft. This tree occurred in a dense grove of trees on a north

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Julián Miralles-Crespo, María J. Sánchez-Blanco, Alejandra Navarro G., Juan J. Martínez-Sánchez, Jose A. Franco L., and Sebastián Bañón A.

popular commercial shrub from China and Japan [ Pittosporum tobira (Thunb.) Ait. cv. Nana]. The first two species have a columnar form, whereas the last one is short and wide. The plants were transplanted during the first week of Nov. 2007 into black