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David R. Coyle, Brayden M. Williams, and Donald L. Hagan

Callery pear ( Pyrus calleryana ) was brought to the United States in the early 1900s for grafting onto fruit-producing european pear ( Pyrus communis ) trees to aid in fire blight management efforts ( Culley and Hardiman, 2007 ). Although this

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Todd C. Einhorn, Janet Turner, and Debra Laraway

/box) equating to 248,600 tons ( Ing, 2002 ). ‘Anjou’ pear trees are inherently vigorous and non-precocious but have a long productive life; consequently, a large percentage of ‘Anjou’ acreage has not undergone renovation and exists at low tree densities (less

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Rayane Barcelos Bisi, Rafael Pio, Daniela da Hora Farias, Guilherme Locatelli, Caio Morais de Alcântara Barbosa, and Welison Andrade Pereira

The pear tree ( Pyrus spp.) is a temperate-climate fruit species, and its cultivation in subtropical regions was made possible by hybrid cultivars obtained from the cross Pyrus communis × Pyrus pyrifolia ( Curi et al., 2017 ). This cross

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S. Laywisadkul, C.F. Scagel, L.H. Fuchigami, and R.G. Linderman

and Ocamb, 2002 ). Recently, growers of pear nursery trees in the PNW have reported increased incidence and severity of damage to trees by P. syringae when ‘Old Home × Farmington 97’ pear (‘OHF 97’) rootstock is sprayed with urea and chemical

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Lexie McClymont, Ian Goodwin, Desmond Whitfield, Mark O’Connell, and Susanna Turpin

, 2018 ). Traditionally, pears in the Goulburn Valley were grown on trees trained as vase, planted at low tree density (6 × 6 m planting square) with D6 rootstock. While these production systems are considered appropriate for canning market production

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Karen Mesa, Sara Serra, Andrea Masia, Federico Gagliardi, Daniele Bucci, and Stefano Musacchi

. Loescher et al. (1990) noted that treatments like defoliation or pruning performed in the orchard affect mainly roots in terms of depletion of stored carbohydrates. In one of the first studies on carbohydrate reserve dynamics in pear trees, Cameron (1923

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Akira Tateishi, Kenji Nagashima, Francis M. Mathooko, Mercy W. Mwaniki, Yasutaka Kubo, Akitsugu Inaba, Shohei Yamaki, and Hiroaki Inoue

Dr. F.M. Mathooko was supported by a Japan Society for the Promotion of Science (JSPS) Invitation Fellowship for Research in Japan. The authors are grateful to Prof. Naoki Sakurai, Hiroshima Univ., for helpful discussion. The phylogenetic tree was

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Chenggang Wang, Rolf Färe, and Clark F. Seavert

In this paper we analyze the sources of variation in revenue per unit of trunk cross-sectional area (TCA) across a 0.87-ha block of 272 pear (Pyrus communis L.) trees in 2003. Revenue capacity efficiency associated with TCA provides an overall measure of nutrient deficiency and revenue inefficiency caused by environmental constraints in the fruit production process. Data envelopment analysis (DEA) is adopted to estimate revenue capacity efficiency and its components. The deficiencies of macro- and micronutrients are measured and optimal nutrient levels computed for each individual tree. These measures are aggregated for comparing between grids and between rootstocks.

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A. Richard Renquist, Horst W. Caspari, and David J. Chalmers

Nashi pear (Pyrus serotina Rehder, cv. Hosui) trees were planted in 12 computerized 1m-wide drainage lysimeters in September 1987. During the 1990 season tree water use was monitored via lysimeter and neutron probe readings. Diurnal leaf water relations were studied using a pressure chamber for water potential (ψ) and a porometer for leaf conductance (gs). Xylem sap trunk flow velocities were measured with an experimental heat pulse device and converted to xylem flux. Close agreement existed between 24 hr xylem flux and lysimeter water use when comparing trees with different soil water content. Xylem flux also was very sensitive to changes in evaporative demand. During 9–13 day drying cycles pre-dawn ψ became progressively lower, morning decline more rapid, and afternoon recovery slower. The diurnal gs pattern also shifted during drying cycles, such that gs of water stressed trees always decreased from time of first measurement of sunlit leaves rather than increasing during the morning as on non-stressed trees. Late afternoon was the best time to distinguish between fully irrigated and stressed trees using gs measurements.

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Fenton E Larsen and Stewart S. Higgins

144 POSTER SESSION (Abstr. 586–598) Culture and Management–Temperate Tree Fruits