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Jill Marie Calabro, Robert A. Spotts and Gary G. Grove

As production of sweet cherries ( Prunus avium L.) has flourished in Oregon and Washington, so has powdery mildew caused by the fungus Podosphaera clandestina (Wall.:Fr) Lev. Fruit infected with P. clandestina develop unsightly blemishes after

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F. Kappel, P. Toivonen, D.-L. McKenzie and S. Stan

Research Commission, Oregon Sweet Cherry Commission, and the Matching Investment Initiative program of Agriculture and Agri-Food Canada is greatly appreciated.

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Moritz Knoche, Eckhard Grimm and Henrik Jürgen Schlegel

Rain-induced cracking severely limits production of many soft-textured, drupe, and berry fruits. Sweet cherry is a prominent example of the former ( Christensen, 1996 ). Cracking is commonly assumed to result from increased fruit turgor, caused by

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Marlene Ayala and Gregory Lang

; Teng et al., 2001 , 2002 ; Wünsche et al., 2005 ). In sweet cherry, reproductive and vegetative growth occurs simultaneously during spring and early summer ( Roper et al., 1987 ). FS and NFS leaf area (LA) is derived from preformed vegetative

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Yiannis G. Ampatzidis and Matthew D. Whiting

The harvest process for most fresh-market tree fruit crops is labor-intensive and time-consuming. For sweet cherry ( Prunus avium L.), harvest costs generally account for 50% to 60% of total production costs ( Seavert et al., 2008 ), yet despite

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Andreas Winkler, Max Ossenbrink and Moritz Knoche

Rain cracking is a problem for sweet cherry production in all countries where this very high-value crop is grown ( Christensen, 1996 ). Despite considerable research effort the mechanistic basis of the phenomenon is still poorly understood. The

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Frank Kappel

Low-temperature injury to sweet cherry fruit buds during bloom can significantly reduce production. Careful site selection to avoid spring frosts is an important consideration when planting new sweet cherry orchards ( Longstroth and Perry, 1996

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Eckhard Grimm, Stefanie Peschel, Tobias Becker and Moritz Knoche

Rain-cracking severely limits sweet cherry production worldwide ( Christensen, 1996 ). By breaching fruit skin integrity, it exposes the underlying flesh to rapid drying and to invasion by insects and pathogens. Cracking is thought to be related to

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Marco Beyer, Stefanie Peschel, Moritz Knoche and Manfred Knörgen

Water uptake in different regions of the sweet cherry fruit (Prunus avium L. cv. Sam) was investigated following selective application of silicone sealant to the pedicel end, pedicel cavity, pedicel/fruit juncture, or stylar scar of detached fruit. The time course of water uptake was monitored gravimetrically during a 3-hour incubation period in deionized water (20 °C). Sealing the pedicel end and/or pedicel/fruit juncture significantly reduced rates and total amount (3 hours) of water uptake, but sealing the stylar scar had no effect. The amount of water penetrating via the pedicel/fruit juncture increased between 50 and 85 days after full bloom. During the same period the maximum force required to detach pedicels from fruit (fruit removal force) fell from 5.2 ± 0.5 to 2.1 ± 0.2 N. The amount of water penetrating via the pedicel/fruit juncture and the fruit removal force were negatively related. Nuclear magnetic resonance (NMR) imaging of mature fruit incubated in D2O indicated that D2O accumulated in the pedicel cavity region and the pedicel. Our data suggest that the pedicel end and pedicel/fruit juncture, but not the stylar scar, are regions of preferential water uptake in detached fruit. Chemical name used: deuterium oxide (D2O).

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Paul A. Wiersma, Deniz Erogul and Shawkat Ali

An international breeding program has an ongoing requirement to reliably identify their cultivars to maintain correct material during propagation and for enforcement of plant breeders’ rights. The sweet cherry breeding program from the Summerland