Walnut History and Production in California Richard P

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Walnut History and Production in California Richard P. Buchner UCCE Farm Advisor Tehama County,

Walnut History and Production in California Richard P. Buchner UCCE Farm Advisor Tehama County, California and Terri A. Buchner

Historical accounts of walnuts in California mention the hard-shelled walnuts brought in from South

Historical accounts of walnuts in California mention the hard-shelled walnuts brought in from South America by the mission fathers in the 1770’s Smith et al. 1912, Webber and Goodspeed 1919, Batchelor 1924, Batchelor et al. 1945

In 1869 Joseph Sexton purchased a large sack of walnuts at the dock in

In 1869 Joseph Sexton purchased a large sack of walnuts at the dock in San Francisco and planted a thousand trees at his ranch in Goleta, California. The origin of these nuts is uncertain, perhaps Chile or China

About 1870 Felix Gillet, a nurseryman in Nevada City, California, was importing scion wood

About 1870 Felix Gillet, a nurseryman in Nevada City, California, was importing scion wood and nursery stock from France. He is credited with introducing the French cultivars Franquette, Mayette, Chaberle, Meylan, Parisienne, Proparturiens and Cluster.

As a result of the introduction by Sexton and Gillet, California walnut growers found

As a result of the introduction by Sexton and Gillet, California walnut growers found superior open-pollinated seedlings that led to the cultivars Eureka, Placentia, Concord, Payne, Hartley and others.

All of the early walnut cultivars were obtained by selecting seedlings that occurred by

All of the early walnut cultivars were obtained by selecting seedlings that occurred by chance. 1879 to 1885 Luther Burbank walnut breeding: j. hindsii x j. regia èparadox j. hindsii x j nigra èroyal

Historical Acres • By 1914, 34, 138 acres of walnuts in California • By

Historical Acres • By 1914, 34, 138 acres of walnuts in California • By 1933, 110, 700 bearing acres • By 1940 walnut planting moved north

Decline in Southern California acreage • Increased land values • Competition with citrus •

Decline in Southern California acreage • Increased land values • Competition with citrus • Northern orchards were superior in yield and quality • Water quality problems • Lack of chilling • Post WW 2 housing demands (urbanization)

As the walnut industry expanded in California, growers soon experienced marketing problems • First

As the walnut industry expanded in California, growers soon experienced marketing problems • First local cooperative in 1887 • Walnut growers of Southern California 1896 • Walnut growers Association in 1912 • Walnut Control Board in 1933 • Diamond Walnut Growers in 1956

The Walnut Marketing Board 1962 (California Walnut Board) • Implement the federal marketing order

The Walnut Marketing Board 1962 (California Walnut Board) • Implement the federal marketing order – Orderly marketing – Quality control – Product promotion – Market development – Prohibition of unfair trade practices – Financing production and industry research

California Walnut Commission 1987 • Promote the export of California walnuts • Inshell Exports

California Walnut Commission 1987 • Promote the export of California walnuts • Inshell Exports to Hong Kong, China, Turkey, Vietnam, Italy and Spain • Shelled Exports to Japan, Germany, Korea, Canada, Spain and Australia

Eugene F. Serr Harold I. Forde UC Davis walnut breeding program 1948 -1978

Eugene F. Serr Harold I. Forde UC Davis walnut breeding program 1948 -1978

By 1956 Serr and Forde clearly identified objectives of their breeding program: • Two

By 1956 Serr and Forde clearly identified objectives of their breeding program: • Two or more flowers per pistillate bud • 50% or more lateral fruitfulness • Nut size 38 to 42 mm length • Kernels of 8 to 10 gms dry weight • Pollen shedding coordinated with flowering

• • • Late leafing Late nut maturity Kernel 50 to 60% of

• • • Late leafing Late nut maturity Kernel 50 to 60% of the net weight Light kernel color with good flavor Smooth shell with a strong seal Tree vigor and strength

By 1956 Serr and Forde had made: • 39 different crosses • pollinated 15,

By 1956 Serr and Forde had made: • 39 different crosses • pollinated 15, 691 pistillate flowers in controlled crosses • derived 833 seedling progeny to be evaluated and selected for desirable characters

Harvest by Hand

Harvest by Hand

Mechanization of the California Walnut Industry

Mechanization of the California Walnut Industry

Almost all USA walnuts are grown in California

Almost all USA walnuts are grown in California

California Walnut Board Inventory Report Year Ending August 31 Crop Year USDA Final Crop

California Walnut Board Inventory Report Year Ending August 31 Crop Year USDA Final Crop Size (tons) 2007/08 325, 000 2008/09 436, 000 2009/10 437, 000 2010/11 503, 000 2011/12 461, 000 2012/13 497, 000

Questions

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