Walnuts Chapter 23. CA Walnuts Bearing Acreage CA Nonbearing Acreage.
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Transcript of Walnuts Chapter 23. CA Walnuts Bearing Acreage CA Nonbearing Acreage.
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Walnuts
Chapter 23
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CA Walnuts Bearing Acreage
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CA Nonbearing Acreage
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CA Acreage 1987 - 2005
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CA Yields per Acre
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Cost of Production
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Cost of Production
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Harvest Costs
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Cash overhead
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Noncash overhead
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Assumptions
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Tree Growth and limiting factors• 30 to 40 feet tall.• Older Var. Bear fruit 5 to 7
years after planting.• Newer Var. Bear fruit 3 to 4
years after planting.• Can remain productive for up to
50 years.• Wind pollination, thus no petals.• Chilling hours = 800.• Walnuts need 42 – 45” of
water/year
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• Climate needed is a cool, moist winters and hot dry summers.
• Walnuts are cold hardy to about 100F.
• Plant in deep soils, at least 10’ deep
• Production = 2,000 – 5,000 lbs/acre
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Site Selection
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Selecting Rootstocks
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Choosing Cultivars
• Chandler• Tulare• Hartley• Vina• Serr• Payne• Franquette• Chico
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Orchard Layout
• Depends on the size of the tree.• See page 465
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Orchard Floor management, Irrigation & Fertilizers
• Floor– Winter cover crop– Mow in spring once 4-5”
• Irrigation– Flood– Micro sprinklers– Drip
• Fertilizer
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Insects
Navel Orangeworm
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Codling moth
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Two Spotted Spider Mite Southern Fire Ant
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Walnut Husk Fly
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Diseases – Deep Bark Canker
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Shallow Bark Canker
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Crown Gall
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Phytophthora
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Walnut blight
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Weeds