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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.

screen shot of June 2024 Fruit Matters

Fruit Matters – Tree Fruit News June 2024

In this issue of Fruit Matters, information about sampling for little cherry/X-disease, leafhoppers, crop insurance, the new FMSA rule, heat stress, weather, and more.

Recent News

WSU Decision Aid System Update June 2024

Published on
Use DAS to consider natural enemies when controlling pests

AWN Update

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The month of May saw the resumption of Mesonet station construction by the AgWeatherNet (AWN) Field Team and an expansion of our air quality network.…

Free earwigs and earwig training, Wenatchee, Yakima, Hood River, and Whatcom, 2024

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Come get a free bucket of earwigs for your farm. July workshops will cover methods to mass-collect this stone fruit pest and transport them to…

There is More to Crop Insurance Than Signing Up

There is More to Crop Insurance Than Signing Up

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Crop insurance is a critical risk management tool available to fruit growers.

FDA Releases FSMA Final Rule on Pre-Harvest Agricultural Water (Subpart E)

FDA Releases FSMA Final Rule on Pre-Harvest Agricultural Water (Subpart E)

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On May 6th, the Food and Drug Administration (FDA) published a final rule on pre-harvest agricultural water, replacing the 2015 Produce Safety Rule requirements. The…

First Generation Leafhopper Adults Now Present

Published on
First generation adult leafhoppers known to transmit X-disease are now present in Washington orchards. Consider monitoring.

Sampling and Testing for X-disease and Little Cherry Disease

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If you have trees with small, misshapen or poor colored fruit and suspect Little Cherry or X-disease, sample if the disease has not been previously…

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Upcoming Events


2024 Virtual Orchard Meetups – Water Wisdom: Navigating Tree Fruit Production Through Drought and Deluge

Zoom Webinar
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WA 64 Spring Field Tour North Central Washington

WSU Sunrise Orchard
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2024 Virtual Orchard Meetups – Water Wisdom: Navigating Tree Fruit Production Through Drought and Deluge

Zoom Webinar
Event Details


Pear Pest Management Discussion Group

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CPAAS and Ag Weather Network Open House

WSU-Prosser Roza Orchard
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Featured Videos

Screenshot Soil Moisture Sensors

WSU Weather School: Soil Moisture Sensors

A presentation by R. Troy Peters, PHD, PE, Professor/Extension Irrigation Engineer, WSU Prosser
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AgWeatherNet Web Portal

AWN portal use presentation by Sean Hill, Application Systems Analyst, WSU AgWeatherNet
Ag Weather Net video title page screenshot, Technical Update on Washington's' Weather Network

Technical Update for AWN

A presentation by Jonathan Contezac, Field Meteorologist at AWN Mount Vernon
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AWN Overview

An overview of the WSU AgWeatherNet. AWN collects and delivers high quality, site-specific weather data and products for effective agricultural decision-support, serving irrigated agriculture in central Washington and the rest of the state (farmers, gardeners,…
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Managing Mites in Pears

Rebecca Schmidt Jeffris discussed spider mites, rust mites, and blister mites: how different active ingredients work, efficacy, pesticide effects on natural enemies, weed associations and pesticide impacts on outbreaks at NCW Tree Fruit Days. NCW…

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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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