Gayle M. Volk, USDA-ARS, National Laboratory for Genetic Resources Preservation, 1111 S. Mason St., Fort Collins, Colorado, U.S.A. 80521.

John E. Preece, USDA-ARS National Clonal Germplasm Repository, One Shields Drive, University of California, Davis, California, U.S.A. 95616.


The eBook “Field Tour of the USDA National Clonal Germplasm Repository for Tree Fruit, Nut Crops, and Grapes” was developed through a collaboration between Colorado State University and the United States Department of Agriculture. The chapters herein provide training modules in various topics relating to the genetic resource management of clonally propagated plant genetic resources of crops adapted to Mediterranean climates. The current version has 10 chapters. It is a work in progress, and content will be added as time and resources allow.

This eBook contains chapters that can be accessed in any order. Click on “Contents” in the upper left corner and links to the chapter titles are shown. Chapters can also be navigated by clicking arrows at the bottom of each page. Each chapter includes text, video and interactive content on a single page.

Material may be used free of charge with attribution of content, in the online format, for personal use or for trainings and courses for students and/or employees. If you wish to make modifications to the content or download other versions, please contact the authors.

Mention of trade names or commercial products in this eBook is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or part of an individual’s income is derived from any public assistance program. Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA’s TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer.


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This work (Field Tour of the USDA National Clonal Germplasm Repository for Tree Fruit, Nut Crops, and Grapes in Davis, California by Gayle M. Volk and John E. Preece) is free of known copyright restrictions.

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