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Tree Fruit

Tree Fruit Research and Extension

WSU Tree Fruit Research and Extension develops and applies research-based information for sustainable tree fruit production in Washington and the world.

Recent News

2023 WTFRC Little Cherry Disease Funding Summary

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Summary of the 2023 Washington Tree Fruit Research Commission Little Cherry Disease Funding.

Resources for Little Cherry & X-disease Scouting and Sampling 2023

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Resources available for scouting and sampling of X-disease and Little Cherry disease during the 2023 season.

WSU Decision Aid System Update June 2023

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As warm weather continues, follow updates to important pest, pathogen, and fruit growth models on DAS.

Summer pear psylla management, 2023

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Phenology-based pear psylla management options are under evaluation on commercial farms. Programs in the Wenatchee Valley are defined and compared in this article.

Rally the troops: free earwigs to be distributed to pome fruit growers at TFREC workshop

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Earwigs are a powerful pest management ally in apple and pear. Get some for free on July 12 at a WSU event led by the…

Pruning out Fire Blight Infections

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It is important to quickly prune out fire blight infected materials soon after an infection occurs to reduce the bacterial ooze which insects and wind…

Updates from WSDA Pesticide Management Division

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Prevent Pesticide Drift As spraying season approaches WSDA is reminding pesticide applicators to ensure pesticides do not drift off target and offering tips on how…

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Upcoming Events


WSU Extension Little Cherry Disease Field Day – Mattawa WA

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A Garden Faire – WSU Master Gardener Program

Community Education Garden
Event Details


Fire Blight Webinar Series: Fire Blight Pruning and Sanitation

Event Details


WSU Extension Little Cherry Disease Field Day – Buena WA

Event Details


Fire Blight Webinar Series: Using Weather & Environmental Conditions to Optimize Biologicals and Biopesticides for Bloom Protection

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Featured Videos

codling moth biology and ecology video thumbnail

Codling Moth Series 01 Biology and Ecology

Peter McGhee presents Codling Moth Biology and Ecology
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Codling Moth Series 02 Predictive Modeling

David Crowder presents Predictive Modeling
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Biopesticides: Efficacy and Use

With increasing organic acreage and scrutiny of antibiotics use, alternatives to antibiotics for the control of fire blight are necessary. Dr. Ken Johnson, Oregon State University, talked about biopesticide efficacy and their use for the…
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Managing Fire Blight Infections: Pruning, Sanitation

Is it important to quickly prune out fire blight infected materials soon after an infection occurs? How we remove them effectively? And what about sanitizing or not our tools? Tianna DuPont, Washington State University Extension,…
logo from PACMAN sessions

PACMAN Briefings: Session 1, Episode 1

Terence Robinson – Updates on horticultural work, Flow chart for Precision Crop Load

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Recent Publications

figure showing releative efficacy of non antibiotic materials.

Evaluation of biopesticides for the control of Erwinia amylovora in Apple and Pear

In a recent study, we evaluated non-antibiotic materials for fire blight control in 8 Washington, 3 Oregon, 3 New York and 2 Pennsylvania field experiments conducted between 2013 to 2022.

Investigations of Multiple Approaches to Reduce Green Spot Incidence in ‘WA 38’ Apple

A pre-harvest apple (Malus × domestica Borkh.) disorder named “green spot” (GS) was recently identified on ‘WA 38’ apples. Previous work indicated a tentative association between GS and fruit mineral imbalance, and an influence of…

Soil Health Indicators for Central Washington Orchards

To help growers in Central Washington orchards, Washington State University scientists demonstrated that all soil health indicators should include measurements of water availability and root health in addition to standard fertility indicators to meet stakeholder…
image shows a tractor pulling a rototiller attachment making individual tilled rows.

Field scale application of Brassica seed meal and anaerobic soil disinfestation for the control of apple replant disease.

Study published June 2021 in Applied Soil Ecology shows potential of anaerobic soil disinfestation and biorenovation with mustard meals for mitigation of replant disease.

Towards rapid detection and mapping of powdery mildew in apple orchards

Chandel, Khot, Sallato Dec 2020. Powdery mildew (PM) in apples is a critical fungal disease that adversely affects yield and fruit quality. Conventional PM identification techniques are laborious. This study evaluated the suitability of non-destructive…

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