Year-Round IPM Program Pages
This year-round IPM program covers the major pests of walnut in California.
- Why is this season important in an IPM program?
- Special issues of concern related to environmental quality: herbicide runoff.
What should you be doing during this time?
Look for dead and infected branches from Botryosphaeria and Phomopsis cankers. Only prune to reduce inoculum if there is a dry period predicted. Otherwise prune during summer.
- Apply preemergence herbicides in-row before fall weeds emerge and include a post-emergence herbicide if weeds have started to emerge. Consider blowing or sweeping leaf debris immediately before applying preemergence herbicides to facilitate herbicide contact with soil.
Remove huller waste materials to reduce navel orangeworm overwintering sites.