walnuts chapter 23. ca walnuts bearing acreage ca nonbearing acreage
TRANSCRIPT
Walnuts
Chapter 23
CA Walnuts Bearing Acreage
CA Nonbearing Acreage
CA Acreage 1987 - 2005
CA Yields per Acre
Cost of Production
Cost of Production
Harvest Costs
Cash overhead
Noncash overhead
Assumptions
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
• 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
Site Selection
Selecting Rootstocks
Choosing Cultivars
• Chandler• Tulare• Hartley• Vina• Serr• Payne• Franquette• Chico
Orchard Layout
• Depends on the size of the tree.• See page 465
Orchard Floor management, Irrigation & Fertilizers
• Floor– Winter cover crop– Mow in spring once 4-5”
• Irrigation– Flood– Micro sprinklers– Drip
• Fertilizer
Insects
Navel Orangeworm
Codling moth
Two Spotted Spider Mite Southern Fire Ant
Walnut Husk Fly
Diseases – Deep Bark Canker
Shallow Bark Canker
Crown Gall
Phytophthora
Walnut blight
Weeds