Walnuts

General Sources

Walnut Production Manual

David Ramos, Dept. of Plant Sciences. This revision of the classic Walnut Orchard Management covers all aspects of walnut production. 1997 (328 pp.) UC ANR Pub. 3373. Link to ANR Catalog for purchase

Walnut Research Reports

A searchable database of annual reports of research in various aspects of walnut production. This database provides reports in pdf format from 1971 to the present.

Production Economics

Sample Costs to Establish a Walnut Orchard and Produce Walnuts (pdf)

J.A.Grant, San Joaquin Co., K.M.Kelley, UCCE Stanislaus Co., J.L.Caprile, UCCE Contra Costa Co., K.M.Klonsky, UCCE and R.L.DeMoura, Dept. Ag. and Resource Economics, UC Davis, 2007 (19 pp.)

Models

Nitrogen Fertilization Model for Walnut

P.H. Brown and Q. Zhang, Plant Sciences, UC Davis, M. Stevenson, UC-SAREP, R.C. Rosecrance, College of Agriculture CSU Chico. Interactive model to calculate nitrogen requirements

Phenology Model: Codling Moth

UC IPM Online

Production Management

Biological Control of Codling Moth: Parasitoid Releases in Walnuts, Apples and Pears (pdf)

Janet Caprile, UCCE Contra Costa Co., Nick Mills, Dept. of Insect Biology, UC Berkeley. 2004 (1 pp.)

Cover Cropping in Walnut Orchards (pdf)

Terry Prichard, UCCE UC Davis, Janine Hasey, UCCE Sutter-Yuba Co. (pdf)

Cover Crops for Walnut Orchards

Joseph Grant, UCCE San Joaquin Co., 2006. ANR publication 21627. Link to ANR Catalog for purchase

English Walnut Rootstocks Help Avoid Blackline Disease, But Produce Less Than "Paradox" Hybrid (pdf)

Joseph Grant, UCCE San Joaquin Co., and Gale McGranahan, Dept. of Plant Sciences UC Davis, in California Agriculture, 2005 (3 pp.)

Guide to Efficient Nitrogen Fertilizer Use in Walnut Orchards

Kathy Anderson. ANR publication 21623. Link to ANR Catalog for purchase

IPM-Based Guidelines for Replanting Walnuts in 2002 without Methyl Bromide (pdf)

Michael McKenry, Nematology Dept., UC Riverside, 2002 (3 pp.)

Three New Walnut Varieties Released from UC Walnut Breeding Program (pdf)

Gale McGranahan, Dept. of Plant Sciences, UC Davis (1 p.)

UC IPM Pest Management Guidelines: Walnut

UC IPM Online

Walnut Fact Sheet

Gale McGranahan, Dept. of Plant Sciences, UC Davis. 1995 (3 pp.)

Walnut Rootstock Selection for Resistance to Phytophthora spp.

G.T. Brown, USDA, ARS, Dept. of Plant Pathology, UC Davis

Walnut Trees in the Nursery Trade: Understanding Terminology, How they are Propagated, Availability and Clonal Rootstock Pest Interactions (pdf)

Janine Hasey, UCCE Sutter-Yuba Cos., Wesley Hackett, Gale McGranahan, Dept. of Plant Sciences UC Davis, Michael McKenry, Nematology Dept. UC Riverside, Greg Browne and Dan Kluepfel, USDA. 2009 (2 pp.)

non-University of California Resources

Crop Profile for Walnuts in California (pdf)

National Science Foundation Center for IPM. 1998 (21 pp.)

Eastern Black Walnut: Potential for Commercial Nut Producing Cultivars

William Reid, in Janick and Simon (eds), Advances in New Crops. Timber Press, Portland, OR,1990

Organizations

California League of Food Processors

Sacramento, CA. Member companies include canners, freezers, dryers and dehydrators of fruits and vegetables

California Specialty Crop Council

Fresno, CA

California Walnut Commission, Walnut Marketing Board

Folsom, CA

Northern Nut Growers Association

US and Canada, no California affiliates

Some links are to sites outside of the UC domain. No endorsement is intended of products, services, or information, nor is criticism implied of similar sites that are not mentioned.