Walnuts
Cost and Expense Considerations
- Cost and Expense Considerations in a Lean Price Year
- IPM on a Budget: Cost Saving Strategies for Insect & Mite Management
- IPM on a Budget: Cost Saving Strategies for Insect & Mite Management (updated June 2024)
- Maximizing walnut quality to improve value in a low-price year
- Panel Discussion: Perspectives on Walnut Economics - a recap
- Prioritizing Sprays When You Can't Afford Them All
- Revisiting Your Codling Moth IPM Program in a Lean Crop Year
- Scale Pests, Navel Orangeworm, and Flatheaded Borers
- Should You Use Ethephon in a Lean Price Year?
- Time for a Hard Look- Walnuts
- Tomato Following Walnut: Considerations and Tips
- Tree and Orchard Replanting Considerations in a Lean Price Year
Diseases
- 2022 Walnut Blight Management Update
- 2023 brown apical necrosis (BAN) and late-season walnut blight
- Activator Spray Adjuvant Selection
- Botryosphaeria Canker & Blight
- Branch Wilt
- Considerations for Replanting Walnut Orchards
- Kasumin - A New Tool for Walnut Blight Management
- Managing Mold in Walnut (Updated 2022)
- Phytophthora Management
- Phytophthora Root and Crown Rot & Paradox Canker Disease in Walnuts
- Points to Consider in Prevention of Crown Gall
- Pre-Season Airblast Sprayer Calibration
- Pruning with Bot Infections in Mind
- The Latest on Managing Bot Canker and Blight in Walnut - 2016 Research Updates
- Treating Crown Gall
- Walnut Blight Bud Sampling
- Walnut Blight Management
- Wet winter concerns: Phytophthora and waterlogging
Flood Damage
- 2017 Research Results on Flood Damaged Trees
- End of 2017 Season Flooded Orchard Damage Update
- Flooded Orchards, Part 1: Generalities of Flooding Damage
- Flooded Orchards, Part 2: Reflections on Past Flooding Events
- Flooded Orchards, Part 3: Management Guidelines to Consider
- Impacts and Recovery on Walnuts from 2017 Flooding
- Preparing for Extreme Events: Flood
- Summer Flooded Orchard Damage Update, Part 1: Observations and Research Plans
- Summer Flooded Orchard Damage Update, Part 2: Management Considerations
- Summer Flooded Orchard Damage Update, Part 3: Resources for Flood Damaged Orchards
- What to Do this Spring for Flood Damaged Trees
Horticulture
- 2020 Walnut Freeze: Road to Recovery
- Autumn freeze damage strikes again (2024)
- Avoiding Freeze Damage
- Chilling Hours Update 2018 - Yuba City
- Chilling Hours Update 2019 - Yuba City
- Chilling Hours Update 2020 - Yuba City
- Counting Winter Chill
- Early Walnut Tree Training: How to Handle Different Nursery Products
- Ethephon for Earlier Harvest
- Fall- Preparing for Extreme Events: Freeze and Fire
- Interpreting Soil Test Results
- Introducing a Butte County Walnut Variety Trial
- Minimize Potential Sudden Autumn Freeze Damage
- November 2020, Another Major Autumn Freeze in California Walnuts
- Oilless Walnuts
- Options for Gopher Management
- Planting a Cover Crop
- Preparing for an early freeze
- Roller Crimping – A Cover Crop Termination Option
- Selecting the Best Walnut Rootstock for Your Situation
- September- Time to Think About Cover Crops in Walnuts
- Six Steps to Prepare for the Next Sudden Autumn Freeze
- Spring- Preparing for Extreme Events: Frost
- Thinking About Skipping or Shorting Nitrogen This Year?
- Tipping the Scales to Favor Walnut Quality
- Tomato Following Walnut: Considerations and Tips
- Training Young Walnut Trees: No Pruning/No Heading vs. Minimum Pruning Compared
- Walnut Autumn Freeze Event and Spring Regrowth Update, 2018
- Walnut Orchards Not Leafing Out
- What new research into carbohydrates is teaching us about California orchards
- Whole Orchard Recycling and Anaerobic Soil Disinfestation
- Winter Chill, Dormancy and Walnut Management
- Winter Chill, Dormancy and Walnut Management – 2023-2024 Update
- Yellowing Trees
Insects & Mites
- 2017 Walnut Insect & Mite Updates
- Aphids and Mites
- Carpophilus beetle ID guide
- Fall Walnut IPM – Looking Back and Looking Forward
- Harvest Damage Evaluation for Walnuts
- In-season-& Post-harvest Management of Navel Orangeworm (NOW)
- IPM on a Budget: Cost Saving Strategies for Insect & Mite Management
- IPM on a Budget: Cost Saving Strategies for Insect & Mite Management (updated June 2024)
- Managing Walnut Orchards for Insect-eating Birds
- Monitoring Codling Moth In and Near Mating Disruption Orchards
- Monitoring for Walnut Scales
- Navel Orangeworm in Walnut
- Navel Orangeworm in Walnuts 2017 – Stay Alert
- Navel Orangeworm Management Considerations to Protect Walnut Quality
- Navel Orangeworm vs Codling Moth Identification Chart
- Pest Reports Available on Sacramento Valley Orchard Source Website
- Post-Harvest Walnut Navel Orangeworm Update-2016
- Walnut Dormant Monitoring and Treatment Decisions
- Walnut Husk Fly Biology, Monitoring, and Spray Timing
- Walnut Husk Fly Trap and Low Volume Spray Study
- “Field Visit: Nematode Management in Walnut” was held in Escalon, CA
Irrigation
- Drought Strategies for Walnut Orchards
- Healthier Orchards with A Careful Start of Irrigation in 2023
- Irrigating Using ETc
- Irrigating with lower quality water? What to consider first.
- Irrigating Young Trees
- Irrigation System Maintenance
- Irrigation with Roots in Mind
- Leaf Symptoms of Overwatered Walnut Trees
- Missing the Target: Why you Should Irrigate Potted Trees Directly onto Potting Media
- Navigating Irrigation Technology Overload
- Northern California Cropping and Irrigation Patterns (Part 1)
- Northern California Cropping and Irrigation Patterns (Part 2)
- Potted Tree Irrigation after Planting: Getting the First Year Right
- Pulling the trigger for the start of irrigation in the spring: Too much too soon for walnuts?
- Soil Moisture Sensor Selection is Confusing
- Thinking About Irrigating This Winter?
- Top Five Questions: Evaluating a Water Supply for Suitability to Irrigate Nut Crops
- Using a Pressure Chamber is Worthwhile
- When Should You Apply the First Irrigation of the Season?
- Winter Irrigation During Drought
- Zone Irrigation, Part 1 - Zone Irrigation Concepts
- Zone Irrigation, Part 2 - Designing a System
Walnut Orchard Development
- Don't tie so close! Plus, other walnut staking considerations
- New walnut variety ‘UC Wolfskill’ released
- Online Tools for Orchard Establishment and Management
- Orchard Soil Preparation
- Planting Bareroot Trees
- Planting Potted Clonal Rootstock
- Replanting Individual Trees
- Replanting into Nematode-Infested Soils
- Tree Spacing
- Walnut Cultivar Table
- Walnut Trees in the Nursery Trade: Terminology, Propagation, Availability, & Pest Interactions
- Whole Orchard Recycling and Anaerobic Soil Disinfestation
Weed Control
- Are you choosing the right spray for the right weeds?
- Increase Your Return on Investment with Post-Harvest Weed Scouting
- New EPA Paraquat Restrictions
- Pre- and Post-Herbicide Performance on Threespike Goosegrass
- Strategies for orchard weed management hard economic situations
- Young Orchard Weed Management
Year-Round Management
- April Walnut Orchard Management Considerations
- August Walnut Orchard Management Considerations
- July Walnut Orchard Management Considerations
- June Walnut Orchard Management Considerations
- March Walnut Orchard Management Considerations
- May Walnut Orchard Management Considerations
- November Walnut Orchard Management Considerations
- October Walnut Orchard Management Considerations
- Post-harvest Management Considerations
- September Walnut Orchard Management Considerations
- Walnut Winter Management UCCE Resources