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Lauren Fessler, Amy Fulcher, Dave Lockwood, Wesley Wright, and Heping Zhu

In orchard and nursery production, severe destruction can be caused by certain pests such as plant diseases, e.g., bitter rot [ Colletotrichum gloeosporioides (Penz.) Penz. and Sacc. and Glomerella cingulata (Stoneman) Spauld. and H. Schrenk] and

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M. Lenny Wells

Nitrogen is the most commonly applied nutrient in orchard crops and is normally applied at higher rates than most other nutrients ( Weinbaum et al., 1992 ). The effect of N on pecan yield and nut growth has been studied since 1918 ( Skinner, 1922

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M. Lenny Wells

Nitrogen is the most commonly applied nutrient in orchard crops and there are multiple options with regard to the form of N applied ( Weinbaum et al., 1992 ). The effect of N on pecan yield and nut growth has been studied since 1918 ( Skinner, 1922

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Penelope Perkins-Veazie and Gene Lester

temperature storage are generally the same for conventional and organic orchards, and good practices must be followed and documented ( Suslow, 2000 ). Fruit should be of the proper maturity. Depending on the species, a crop may ripen earlier or later in an

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Lloyd L. Nackley, Brent Warneke, Lauren Fessler, Jay W. Pscheidt, David Lockwood, Wesley C. Wright, Xiaocun Sun, and Amy Fulcher

frequent applications of pesticides due to intense pressure from pests and diseases and to meet the stringent aesthetic requirements for marketable fruits and vegetables. In apple ( Malus domestica ) orchard and grape ( Vitis vinifera ) vineyards, up to

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M. Lenny Wells

in the cost of a single input dramatically reduces the profit margin for pecan producers. Legumes and manure, produced by cattle grazing the orchards, were commonly used to provide fertilizer N for pecan trees in the early years of the southeastern

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Gregory M. Peck, Ian A. Merwin, Michael G. Brown, and Arthur M. Agnello

roadside and farmers' markets. However, advanced integrated pest management (IPM) and more effective biocontrol agents have recently been successfully used in northeastern U.S. orchards ( Agnello et al., 2003 ; MacHardy, 2000 ; Prokopy et al., 2003

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Claudio Cantini, Riccardo Gucci, and Balilla Sillari

excellent assistance of Luigi Luti, who made his orchard available for the experiments.

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I.A. Merwin, D.A. Rosenberger, C.A. Engle, D.L. Rist, and M. Fargione

this research. We also thank Steven Clarke, Elizabeth Ryan, and John A. Ray for providing orchards, advice, and assistance. Trade names are used in this manuscript solely for identification of material and do not imply any product endorsement.

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Paul Kron, Brian C. Husband, Peter G. Kevan, and Svenja Belaoussoff

1 To whom reprint requests should be addressed. Phone: (519) 824-4120 ext. 4790; Fax: (519) 767-1991; E-mail: bhusband@uoguelph.ca We thank Jack Van Diepen and Bill Derks for access to their orchards, Sue Hall