All of the Categories by Fruits & Nuts : Walnut
Educational Content
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Walnut Education, reviewed by UC Specialists and Farm Advisors
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Content includes: propagation, pollination, fruit set and flower and fruit development, variety selection, pests, and orchard management.
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The Walnut Germplasm Collection of the University of California, Davis
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A description of the collection and a history of the breeding program of Eugene F. Serr and Harold I. Forde
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including Basic Crop Information
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Walnut Education, reviewed by UC Specialists and Farm Advisors
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Content includes: propagation, pollination, fruit set and flower and fruit development, variety selection, pests, and orchard management.
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The Walnut Germplasm Collection of the University of California, Davis
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A description of the collection and a history of the breeding program of Eugene F. Serr and Harold I. Forde
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General Sources
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Walnut Fertilization Guidelines
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User friendly almond fertilization guidelines based on current nutrient management research.
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Walnut Production Manual
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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
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Walnut Research Reports
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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.
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Walnut Trees in the Nursery Trade: Understanding Terminology, How they are Propagated, Availability and Clonal Rootstock Pest Interactions (pdf) 2018 update
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J. Hasey, C. Leslie, W. Hackett, G. McGranahan, P.J. Brown, A. Westphal, M. McHenry, G. Browne, D. Kluepfel
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Walnut Genomics Implementation Group
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Website for research, extension and industry collaborators involved in walnut genomics research
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Models
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Phenology Model: Codling Moth
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UC IPM Online
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SWP: Interactive tool to estimate baseline water potential using CIMIS weather stations
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Ken Shackel, Dept. of Plant Sciences, UC Davis
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Newsletters & Blogs: Farm Advisors - Current Topics
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Field Notes Newsletter - San Joaquin County
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A Newsletter from San Joaquin County Farm Advisors. Research and new developments related to agriculture in the county. Includes almond, walnut, grapes, veg crops, range land.
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Fruit & Nut Notes - Solano and Yolo Counties
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Newsletter from Farm Advisors, Solano and Yolo Counties. Topics in production, principally almond, prune and walnut.
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Orchard Notes - Sutter-Yuba Counties
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Newsletter from Janine Hasey, Farm Adviosr, Sutter-Yuba Counties.
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Crop Currents - Alameda and Contra Costa Counties
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Newsletter from Janet Caprile, Farm Advisor, Alameda and Contra Costa Counties. Primarily cherry, stone fruit, olive, walnut and grape
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Foothill Farms & Orchard News - Amador, Calaveras, El Dorado, and Tuolumne Counties
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Newsletter by Lynn Wunderlich, Farm Advisor, El Dorado and Amador Counties. Orchard crops in Amador, Calaveras, El Dorado, and Tuolumne counties. Apple, pear, stone fruit, cherry, grape, walnut
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Almond Notes - Butte County
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Newsletter from Joe Connell, Farm Advisor, Butte County. Focus on almonds & walnuts.
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Orchard Topics - Colusa County
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Newsletter from John Edstrom, Farm Advisor, Colusa County. Primarily almonds & walnuts.
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Tree Pest Updates: Codling Moth - Alameda and Contra Costa Counties
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Newsletter by Janet Caprile, Farm Advisor, Alameda & Contra Costa Counties. Primarily apple, pear and walnut.
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Walnut Notes - Butte County
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Newsletter from Joe Connell, Farm Advisor, Butte County
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Orchard Facts - Glenn County
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News and updates:orchard crops in northern California counties. Focus primarily on walnut, prune and almond.
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The Kings Crack Out - Kings County
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Newsletter from Bob Beede, Farm Advisor Kings County. Focus on nut crops.
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Orchard Notes - Lake and Medocino Counties
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Newsletter from Rachel Elkins, Farm Advisor, Lake and Medocino counties. Focus on walnut and pear
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The Pomology Post - Madera County
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Newsletter from Brent Holtz, Farm Advisor, Madera County. Topics in tree crop production, including farm safety, irrigation, pest management. Nut crops including almond, stone fruit.
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Tree and Vine Newsletter - Merced County
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Newsletter from David Doll and Maxwell Norton, Farm Advisors, Merced County. Topics in tree crop production, including farm safety, irrigation, pest management.
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Tree Topics (newsletters (2002-2012) - San Benito County
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Newsletter by Bill Coates, Farm Advisor Emeritus, San Benito County. Central coast fruitnand nut orchard production, principally walnut, cherry, apricot, apple
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San Joaquin Pomologist Newsletter - San Joaquin County
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Newsletter from Joe Grant, Farm Advisor, San Joaquin County. Workshop and meeting announcements.
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Walnut News - Stanislaus County
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Newsletter by Kathy Kelley Anderson, Farm Advisor, Stanislaus County.
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Sacramento Valley Walnut News - Glenn, Butte, Colusa, Sutter, Yuba, Yolo, Solano, Sacramento, Tehama
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Newsletters from walnut farm advisors, submitted by Janine Hasey
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Fruit & Nut Newsletters - Tehama County
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Newsletters from Richard Buchner, Farm Advisor, Tehama County. Orchard management for walnuts, almonds and prunes
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In a Nutshell - Tulare County
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Newsletter from Elizabeth Fichtner, Farm Advisor, Tulare County. Orchard management for walnut, almond and pistachio.
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non-University of California Resources
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Crop Profile for Walnuts in California (pdf)
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National Science Foundation Center for IPM. 1998 (21 pp.)
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Eastern Black Walnut: Potential for Commercial Nut Producing Cultivars
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William Reid, in Janick and Simon (eds), Advances in New Crops. Timber Press, Portland, OR,1990
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Organizations
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California Walnut Commission, Walnut Marketing Board
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Folsom, CA
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Northern Nut Growers Association
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US and Canada, no California affiliates
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Production Economics
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Cost and Return Studies by the Dept. of Agricultural & Resource Economics, UC Davis
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Includes: individual studies for most California fruit & nut crops by region. Studies authored by UCCE Specialists & Farm Advisors.
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Production Management
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Cover Cropping in Walnut Orchards
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Terry Prichard, UCCE UC Davis, Janine Hasey, UCCE Sutter-Yuba Co.
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Using the Pressure Chamber for Irrigation Management in Walnut, Almond & Prune - ANR Publ 8623 (pdf)
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by UCCE Farm Advisors Allan Fulton, Tehama Co., Joe Grant, San Joaquin Co., Richard Buchner, Tehama Co., and Joe Connell, Butte Co.
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Biological Control of Codling Moth: Parasitoid Releases in Walnuts, Apples and Pears (pdf)
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Janet Caprile, UCCE Contra Costa Co., Nick Mills, Dept. of Insect Biology, UC Berkeley. 2004 (1 pp.)
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English Walnut Rootstocks Help Avoid Blackline Disease, But Produce Less Than "Paradox" Hybrid (pdf)
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Joseph Grant, UCCE San Joaquin Co., and Gale McGranahan, Dept. of Plant Sciences UC Davis, in California Agriculture, 2005 (3 pp.)
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Guide to Efficient Nitrogen Fertilizer Use in Walnut Orchards
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Kathy Anderson. ANR publication 21623. Link to ANR Catalog for purchase
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IPM-Based Guidelines for Replanting Walnuts in 2002 without Methyl Bromide (pdf)
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Michael McKenry, Nematology Dept., UC Riverside, 2002 (3 pp.)
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UC IPM Pest Management Guidelines: Walnut
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UC IPM Online
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Three New Walnut Varieties Released from UC Walnut Breeding Program (pdf)
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Gale McGranahan, Dept. of Plant Sciences, UC Davis (1 p.)
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Walnut Fact Sheet
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Gale McGranahan, Dept. of Plant Sciences, UC Davis. 1995
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Walnut Rootstock Selection for Resistance to Phytophthora spp.
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G.T. Brown, USDA, ARS, Dept. of Plant Pathology, UC Davis
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Advanced Sensing & Management Technologies to Optimize Resource Use in Deciduous Tree Crops
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UC Research website: a multi-disciplinary project to develop guidelines for nutrient and water management, adaptive to local conditions
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A Nitrogen Budget Worksheet for Walnut
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Kathy Kelley, Farm Advisor, Stanislaus Co., and Joe Grant, Farm Advisor, San Joaquin County. Nitrogen budget worksheet and instructions in its use. 3 pp. Adapted from UC Pub. 21623, 2006.
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SWP: Estimated walnut baseline water potential using current temperature and relative humidity (pdf)
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Ken Shackel, modified by Bruce Lampinen, Dept. of Plant Sciences, UC Davis. 2014. SWP to expect for fully irrigated trees under different conditions of air temp & RH.
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A Walnut Grafting, Budding & Planting Video Series
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Nurseryman Alex Suchan demonstrates the grafting, budding and planting of walnut trees in this series of 14 short videos, produced by Rachel Elkins, UCCE Pomology Farm Advisor & UC ANR.
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Videos on walnut and pistachio orchard management
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by Bob Beede, Kings Co. Farm Advisor
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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.