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Stephen S. Miller, James R. Schupp, Tara A. Baugher, and Scott D. Wolford

It is well established that peach ( Prunus persica L. Batsch) requires some form of thinning early in the growing season to produce a crop of marketable size fruit ( Byers et al., 2003 ; Havis, 1962 ; Tukey and Einset, 1938 ). Early studies by

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Esmaeil Fallahi, Bahar Fallahi, Bahman Shafii, and Mohammad E. Amiri

their initial planting in Idaho ( Yost and d'Easum, 1980 ; Idaho Tree Fruit Census, 2007). Peaches and nectarines ( Prunus persica var. nectarina ) constituted of 18% of the total fruit production in Idaho in 2006, and production of white-flesh peaches

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Norman Lalancette, Daniel L. Ward, and Joseph C. Goffreda

Rusty spot is an important disease of peach ( Prunus persica L. Batsch) that occurs in many fruit-growing regions of the world ( Dolovac et al., 2009 ; Grove, 1995b ; Jankovics et al., 2011 ). Although the disease was first described in 1941

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G.E. Boyhan, B.R. Abrahams, J.D. Norton, and Hongwen Huang

Detection of Xylella fastidiosa Wells et al. by enzyme-linked immunosorbent assay indicated that plums (Prunus hybrids) had higher absorbance values than peaches [Prunus persica (L.) Batsch]. The slip-budded trees had lower readings than those that were chip budded; however, the scion × method interaction was significant. Further comparison of slip vs. chip budding indicated that the lower absorbance value of slip budding occurred in plums only; there was no difference between budding methods in peach.

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David Campbell, Jeffrey K. Brecht, Ali Sarkhosh, Oscar Liburd, and Danielle Treadwell

Photoreceptors and control of horticultural plant traits HortScience 50 1274 1280 https://doi.org/10.21273/HORTSCI.50.9.1274 10.21273/HORTSCI.50.9.1274 Garro, A. Gasull, E. 2010 Characterization of polyphenoloxidase from 2 peach ( Prunus persica L

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I. Citadin, M.C.B. Raseira, F.G. Herter, and J. Baptista da Silva

Differences in heat requirements for blooming and leafing were investigated in peach [Prunus persica (L.) Batsch] using artificially chilled excised shoots and potted trees. `Della Nona' and `BR-1' have high heat requirements; `Planalto', `Sunlite', and `Eldorado' are intermediate; and `Precocinho' and `Riograndense' have low heat requirements. Prolonged chilling enhanced leafing more than blooming. Flower and vegetative buds have different heat requirements during ecodormancy.

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Jorge Pinochet, Cinta Calvet, Adriana Hernández-Dorrego, Ariadna Bonet, Antonio Felipe, and Marian Moreno

Two trials involving 20 Prunus rootstocks were conducted under greenhouse conditions to screen for resistance to root-knot nematode [Meloidogyne javanica (Treub.) Chitwood]. Many of the tested materials are interspecific hybrid rootstocks and represent new commercial peach (P. persica Batsch) and plum (Prunus sp.) releases or experimental genotypes of Spanish, French, and Italian origin. In the first trial, the rootstocks Adesoto 101 (P. insititia L.), Bruce (P. salicina Lindl. × P. angustifolia Marsh.), Ishtara, AC-952 (P. insititia), Garnem [P. dulcis (Mill.) D.A. Webb × P. persica], Cadaman [P. persica × P. davidiana (Carr.) Franch], and Orotava (P. salicina) were immune or resistant to a mixture of 10 isolates of M. javanica. The remaining rootstocks, Myrocal (P. cerasifera Ehr.), Montclar (P. persica), and Adafuel (P. dulcis × P. persica), were susceptible. In the second screening trial, the plum rootstocks Adesoto 101, Adara (P. cerasifera), Myro-10 (P. cerasifera), Constantí (P. domestica L.), and AD 105 (P. insititia) were immune to the root-knot nematode. Cadaman, G × N No. 17 (P. dulcis × P. persica), and Tetra (P. domestica) were resistant. Laroda F1OP (P. salicina), Myro-almond (P. cerasifera × P. dulcis), and the peach–almond hybrids Mayor, Adafuel, and Sirio were susceptible.

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Molly Felts, Renee T. Threlfall, and Margaret L. Worthington

Peaches ( Prunus persica L. Batsch) have been cultivated worldwide for thousands of years. Peaches and nectarines belong to the same species but are differentiated by a single genetic locus that controls pubescence. Peaches and nectarines are both

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Jose X. Chaparro, Ronald R. Sederoff, and Dennis J. Werner

Total cellular DNA has been extracted from leaves and\or seed of Prunus dulcis, P. persica, P. mira, P. davidiana, P. persica subsp. ferganensis, and P. triloba. Chloroplast restriction fragments have been visualized by Southern blot analysis using heterologous probes from a petunia chloroplast library. Analysis of preliminary data separates the species into three groups. The first contains P. dulcis, P. mira, and P. davidiana; the second P. kansuensis, P. persica, and P. persica subsp. ferganensis; and the third P. triloba.

PCR amplification using oligos for cytosolic glyceraldehyde-3-phosphate dehydrogenase yields genomic fragments approximately 1kb in size from P. dulcis and P. triloba. Sequence analysis will be performed to determine species relationships at the gene level.

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J.R. Schupp, T. Auxt Baugher, S.S. Miller, R.M. Harsh, and K.M. Lesser

thinners for thinning peach trees and nectarine ( Prunus persica ) trees trained to perpendicular V or quad V systems; and to compare the effect of a mechanical string blossom thinner at the tight cluster to first pink stage of bud development with an