1. Walnuts Chapter 23

2. CA Walnuts Bearing Acreage

3. CA Nonbearing Acreage

4. CA Acreage 1987 - 2005

5. CA Yields per Acre

6. Cost of Production

8. Harvest Costs

9. Cash overhead

10. Noncash overhead

11. Assumptions

12. 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

13. Climate needed is a cool, moist winters and hot dry summers. Walnuts are cold hardy to about 10 0 F. Plant in deep soils, at least 10’ deep Production = 2,000 – 5,000 lbs/acre

14. Site Selection

15. Selecting Rootstocks

16. Choosing Cultivars Chandler Tulare Hartley Vina Serr Payne Franquette Chico

17. Orchard Layout Depends on the size of the tree. See page 465

18. Orchard Floor management, Irrigation & Fertilizers Floor –Winter cover crop –Mow in spring once 4-5” Irrigation –Flood –Micro sprinklers –Drip Fertilizer

19. Insects Navel Orangeworm

20. Codling moth

21. Two Spotted Spider MiteSouthern Fire Ant

22. Walnut Husk Fly

23. Diseases – Deep Bark Canker

24. Shallow Bark Canker

25. Crown Gall

26. Phytophthora

27. Walnut blight

28. Weeds