Butte County
University of California
Butte County

Prune Notes

Issue Articles  
Preharvest 2024
  • Prune Orchard Considerations
  • Phellinus wood rot, or “Why do my trees blow up at harvest?”
  • Making money at harvest
  • What are you doing for your orchard’s financial longevity?
  • New Staff Research Associate!
7/12/24 Download
(1,163KB PDF)
Summer 2024

• Save the Dates
• Spring & Early Summer Orchard Consideration
• The Big Three in Prunes
• New UC Davis Prune Varieties Prove Promising

4/30/24 Download
(833KB PDF)
Bloom 2024

• Bloom Orchard Considerations
• Bloom weather and prune fruit set: what we know so far
• Potassium Management Options in Prunes
• Managing aphids in prune orchards
• New Advisor!
• Save the Dates
• Fungicide Efficacy
• Herbicide Registration Chart

2/28/24 Download
(814KB PDF)
Fall 2023

• Save the Dates!

• Fall Prune Orchard Management Considerations

• Canker Management: Spray Now or Pay Later

• Replanting Prunes back into Prunes

• Gear Up, Throttle Down to control pests, spray drift, and costs

• Prune Brownline Alert

• New Orchard Advisor Introduction

10/3/23 Download
(1,097KB PDF)
Preharvest 2023

• Preharvest and Harvest Prune Orchard Considerations
• Getting the Best Grower Returns at Harvest
• Potassium review
• New Orchard Advisor

9/25/23 Download
(520KB PDF)
Spring 2023

• Spring & Early Summer Orchard Considerations
• Weather in 30 days after bloom helps plan thinning and harvest
• Why thin prunes?
• The most important task of the year
• Twelve ways to ruin a prune orchard

9/25/23 Download
(1,120KB PDF)
Bloom 2023

• Bloom 2023 Prune Orchard Considerations
• Mechanical Pruning Trial in ‘French’ Prune – Through Year Four
• Bloom weather and prune fruit set: what we know so far.
• Fungicide Efficacy

9/25/23 Download
(2,007KB PDF)
Fall 2022

• Orchard Considerations
• Battle Back Against Cankers Before They Kill Your Trees!
• New prune varieties show promise in reducing fruit drying costs
• New IPM Advisor
• Follow us on Twitter!
• Are your friends getting the newsletter?
• Listen to Growing the Valley Podcast

9/25/23 Download
(1,575KB PDF)
Postharvest 2022
  • UC Davis Breeding Program – 2022 Field Meeting
  • Orchard Considerations
  • Five Practices to Help Prevent Bacterial Canker
  • Late-season Irrigation Management in Prune
  • Pre-harvest Management of Brown Rot
  • Follow us on Twitter!
8/8/22 Download
(1,087KB PDF)
Spring 2022
  • Orchard Considerations
  • New UC Davis Prune Varieties prove promising
  • Mechanical pruning trial in “French” prune.
  • The most important tasks of the year.
  • Adela Contreras
  • Listen to Growing the Valley podcast!
5/13/22 Download
(1,067KB PDF)
Fall 2021
  • Sacramento Valley Tree Crop IPM Webinar
  • Walnut Freeze Webinar
  • Winter/Spring Sacramento Valley Tree Crop meetings
  • Fall Prune Orchard Management Considerations
  • Three Steps to Combat Cytospora Canker
  • Prune Orchard Investments in a Better Market Year
  • New Advisor Introduction
  • Central Valley Pistachio News
10/25/21 Download
(1,040KB PDF)
Pre-& Post-Harvest, 2021
  • Pre-Harvest & Harvest Prune Orchard Considerations, 2021
  • Getting the best grower returns at harvest
  • Fruit set, 2021. What happened?
  • Post-harvest Orchard Clean Up and Pruning – A Pruner’s Pocket Guide
  • For a Healthy Orchard Next Spring, Follow Through on
    Late Season Irrigation in Your Prune Orchard
  • New Staff Research Associate Introduction
  • New Chico State Orchard Researcher Introduction
  • 2021 Summer Field Meeting
  • Growing the Valley Podcast
7/27/21 Download
(1,287KB PDF)
Spring 2021
  • Spring & Early Summer Orchard Considerations
  • Checking Cropload and Shaker Thinning Prunes
  • Statewide Prune Day Recording
  • New Staff Research Associate
  • Irrigating with lower quality water? What to consider first
  • Tree and Vine Crop Herbicide Chart – Updated (2021)
7/2/21 Download
(695KB PDF)
July 2020
  • Advisor Farewell
  • Pre-Harvest Prune Orchard Considerations
  • Pre– and Post-Harvest Irrigation Management in Prune
  • Prune Harvest Prep: Crop Maturity and Fruit Size Checks
7/2/21 Download
(827KB PDF)
October 2020
  • Long Pruning Webinar - Recorded
  • SAVE THE DATE! UC Prune Research Conference
  • Fall & Winter Prune Orchard Management Considerations
  • Cytospora: A Prune Grower’s Arch Nemesis
  • New UC Davis Prune Cultivars Prove Promising
7/2/21 Download
(1,258KB PDF)
May 2020
  • Spring & Early Summer Orchard Considerations
  • Thinning Prunes
  • Update on Rootstocks for Prune Production

 

7/2/21 Download
(864KB PDF)
03/06/2020
  • Orchard Considerations for Bloom and Beyond
  • Young Orchard Weed Management
  • New EPA Paraquat Restrictions
  • Navigating Irrigation Technology
  • Prune Fungicide Efficacy Tables
3/6/20 Download
(1,236KB PDF)
10/03/2019
  • Newsletters are going online!
  • Post-Harvest Almond & Walnut IPM Workshop
  • 2019 IPM Breakfast Meetings
  • Fall & Winter Prune Orchard Management Considerations
  • Long Pruning for Greater Early Yields
  • Cytospora: A year-round fight
  • Increase Your Return on Investment with Post-Harvest Weed Scouting
10/3/19 Download
(1,581KB PDF)
07/31/2019
  • Butte County Newsletters Going Online!
  • IPM Breakfast Meetings
  • Pre-Harvest & Harvest Prune Orchard Considerations
  • 2019 Canker Review
  • Delivering the largest fruit possible this year.
7/31/19 Download
(1,952KB PDF)
04/25/2019
  • Newsletters are going online!
  • 2019 IPM Breakfast Meetings
  • Prune Management Considerations: Spring -- Summer
  • The Advantages of Tighter Spacing and Greater Light Interception in California Prune Orchards
  • Thinning Prunes
  • Updated cost of producing prunes now available
4/25/19 Download
(1,579KB PDF)
01/29/2019
  • Newsletters are going online!
  • 2019 IPM Breakfast Meetings
  • N. Sacramento Valley Prune Day (Feb 22nd)
  • Orchard Considerations
  • Bloom Disease Treatments and Honey Bee Safety
  • Update on Heart Rot in Prunes
  • Is This a Year to Skip Thinning?
  • Weed Management Considerations When Replanting Trees
  • Fungicide Efficacy and Timing Tables for Prune
  • Trends in World Prune Markets
1/29/19 Download
(1,688KB PDF)
10/18/2018
  • Butte County Newsletters are going online!
  • 3rd Annual Post-Harvest IPM Workshop
  • Fall & Winter Prune Orchard Management Considerations
  • Cytospora Post-Harvest: Cut it out! Protect fresh cuts!
  • Pros and Cons of Mechanical Pruning
12/18/18 Download
(1,386KB PDF)
06/19/2018
  • Growing the Valley 
  • Pre-Harvest & Harvest Prune Orchard Considerations 
  • Managing canker diseases in prune orchards 
  • Prune Harvest Timing 
  • July Leaf Sampling
8/28/18 Download
(980KB PDF)
02/20/2018
  • South Sacramento Valley Prune Meeting
  • Prune Bloom Orchard Management Considerations 
  • Dry, Warm, Winter Raises Questions about Irrigation 
  • Thinning Prunes 
  • Evaluating New Rootstocks: What’s the Latest? 
  • New Hazard for Interplanted Orchards 
  • Fungicide Efficacy
3/26/18 Download
(1,878KB PDF)
10/02/2017
  • Advances in Prune Production
  • Fall Prune orchard management considerations following a heavy crop
  • Aphid Management Review
  • Upcoming IPM Breakfasts
  • New Farm Advisor Introduction
6/20/18 Download
(861KB PDF)
05/27/2017
  • Techniques to Time First Irrigation Dates for Prune 
  • Thinning Prunes 
  • Prune Orchard Nutrition: Thoughts for 2017 
  • Why are Some Prune Trees Yellow in the Spring? The Bicarbonate Blues. 
  • Prune Management Considerations: Late Spring through Summer
3/26/18 Download
(848KB PDF)
03/17/2017
  • Crop Load Adjustment (Thinning Prunes) 
  • Options for Bad Weather at Bloom 
  • Fungicide Efficacy Tables 
  • Bloom Orchard Management Considerations
3/26/18 Download
(1,480KB PDF)
10/17/2016
  • Food for Thought When Planting a New Prune Orchard 
  • Potted Tree Irrigation After Planting: Getting the First Year Right 
  • Fall Prune Orchard Management Considerations Following a Light Crop
  • Preliminary Observations for New Prune Rootstocks 
  • Prune Industry Summit 2017
3/26/18 Download
(961KB PDF)
02/19/2016
  • 2015 Field Evaluation of Prune Rootstocks 
  • Fungicide Efficacy Tables 
  • Nitrogen Management for Prunes 
  • Prune Bloom Orchard Management Considerations
3/26/18 Download
(1,918KB PDF)
05/25/2016
  • Prune Bloom, 2016 
  • Weekly Soil Moisture Loss Reports to Assist With Water Management 
  • Pocket Gopher Management: Don’t Wait Too Long! 
  • Prune Orchard Management Considerations – Fruit Development to Harvest
3/26/18 Download
(867KB PDF)
11/02/2015
  • Rain and pruning don’t mix 
  • Weed management in prunes 
  • Gear Up, Throttle Down for pest control and cost savings 
  • A good year for a fall spray in prunes? 
  • Fall orchard management considerations
3/26/18 Download
(900KB PDF)
07/21/2015
  • Predicting an Early ‘French’ Harvest 
  • Blue Prune 
  • Prune Cracking 
  • Pre-Harvest Practices to Consider
3/26/18 Download
(713KB PDF)
04/22/2015
  • Warm postbloom weather = early harvest? 
  • How hot was it at bloom, 2015? 
  • Drought strategies for California prune production 
  • Crop load assessment and adjustment 
  • N budgeting following the 4 Rs 
  • Prune Orchard Management Activities May through July
3/26/18 Download
(1,171KB PDF)
02/23/2015
  • South Sac Valley Prune Meeting 
  • Prune Orchard Activities February to May 
  • Heat at Bloom Update ? Honey Bee Safety During Prune Bloom 
  • Pesticide Safety Train the Trainer Workshops, March 12th in Davis 
  • Fungicide Treatment Timing and Efficacy Tables
3/26/18 Download
(2,337KB PDF)
10/01/2014
  • Fall Orchard Considerations 
  • Irrigation System Maintenance 
  • Cytospora Cankers can Destroy an Orchard 
  • Fall Weed Management Considerations in Prune Orchards 
  • Potassium Nutrition: Maintaining Optimum Levels by Replacing What You’ve Lost
  • Save the Date
3/26/18 Download
(1,987KB PDF)
06/18/2014
  • New IPM Advisor Introduction 
  • New Farm Advisor Introduction 
  •  Advisor Retirement – Thanks! 
  • Scouting for Spider Mites in Prunes 
  • Deficit Irrigation for French Prune 
  • Chill model comparison – Why two models judged last winter very differently
  • Nitrogen Management in Orchard Crops -- Red Bluff Meeting July 24th
3/26/18 Download
(549KB PDF)
04/16/2014
  • Prune aphids in Spring & Summer 
  • Irrigating French prune during a drought 
  • Efficient nitrogen management in prune production 
  • Low chill winter? 
  • How hot was it at bloom, 2014?
3/26/18 Download
(716KB PDF)
07/03/2013
  • Blue prune drop and leaf scorch
  • Earlier harvest in 2013?
  • 2013:  A tough year for cankers

                  

9/5/13 Download
(758KB PDF)
04/08/2013
  • Orchard Irrigation 2013
  • Prune Tissue Sampling for Leaf Analysis
  • How hot was it at bloom, 2013
  • Efficient Nitrogen Management in Prune Production

                    

9/5/13 Download
(624KB PDF)
01/31/2013
  • Heat at Bloom Update
  • Nitrogen Management for French Prune
  • Brown Rot Blossom/ Twig Blight & Preventing Fungicide Resistance
  • New 2012 Prune Cost Study for the Sacramento Valley
  • Red Bluff Prune Day Feb 8th --- Yuba City Prune meeting Feb. 27th
2/1/13 Download
(1,159KB PDF)
03/15/2012
  • Heat at bloom update
  • It's your money
  • Mobile Irrigation Lab Service
  • Fungicide Timing and Efficacy Tables
3/15/12 Download
(557KB PDF)
10/11/2012
  • Prune orchard nutrition
  • Fall spray for prune aphid management
  • Prune out Cytospora cankers to reduce disease
  • Two different spots on prune leaves
10/16/12 Download
(873KB DOC)
07/20/11
  • Managing fruit brown rot and prune rust.
  • Blue prune drop and leaf scorch.
  • Bloom time temperatures compared to fruit set in 2011.
  • Update on Spotted Winged Drosophila in prunes.
  • When will harvest start in 2011?
7/20/11 Download
(3,382KB PDF)
07/30/2010
  • What can you do now to produce the largest prunes possible?
  • Field sizing French prune
  • Managing fruit brown rot in prunes 
  • Spotted winged Drosophila: new damaging pest in prunes?
7/30/10 Download
(PDF)
10/4/2010
  • Prune out Cytospora cankers to reduce disease
  • Fall spray for prune aphid management
  • Scale pests in prune orchards and keeping a balance of natural enemies
    to control them
  • Using a high oil rate before bloom: Why do it?
10/4/10 Download
(1,006KB PDF)
08/13/2012
  • Managing prunes through harvest
  • Sizing prunes at harvest
  • Distinguishing between branch dieback disorders
  • New Prune Production Manual Available
8/16/12 Download
(662KB PDF)
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