Skip to main content Skip to navigation

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

Recordings from the Pear Rootstock & Systems Webinar Now Available

Published on
The Pear Rootstocks and Systems Virtual Field Tour Webinar held on August 14 was a successful event with 164 registrants. The events tag line was…

Winter Educational Opportunities

Published on
WSU Tree Fruit Extension will provide a variety of learning opportunities this fall and winter in order to continue to bring growers research-based information while…

Ambrosia Harvest Indices and CA Storage Protocols in British Columbia

Published on
To date, Ambrosia maturity has largely been determined by starch index. The general recommendation is to start harvest at a starch of 2.6 and finish…

X-disease, Little Cherry Disease Impact Survey

Published on
In order to provide data to build awareness, justify grants, assistance and county funds disbursement WSU Extension is surveying Little Cherry Virus and X Phytoplasma…

2020 Cherry MRL Report

Published on
Since 2011, the Washington Tree Fruit Research Commission has conducted annual studies to provide the Northwest cherry industry basic information about residues of commonly used…

WA 38/Cosmic Crisp® pre-harvest events scheduled and 2020 Documents available

Published on
It’s T minus 50-60 days before WA 38/Cosmic Crisp® harvest season begins. Color and size are coming on and there is great anticipation for a sizable…

Case studies on tree removal for X-disease phytoplasma and Little cherry virus

Published on
August and early September are good times to remove trees infected with X-disease phytoplasma and Little cherry virus. Quick removal reduces the time infected trees…

More News


Extension ITT Coordinator for TF Postharvest Systems

This is a fantastic opportunity to collaborate with the tree fruit industry to capture opportunities and solve challenges in postharvest systems. The application is online only here. If you have specific questions about the position…

ITT Publications Coordinator for Tree Fruit Extension

Here’s a great opportunity to work with the WSU Tree Fruit Extension Team to ensure outreach is effectively delivered across multiple platforms to communicate with a diverse audience including tree fruit growers, allied industry, orchard…

Upcoming Events


WA 38 Grower/field staff pre-harvest Q and A web meeting

Event Details


WA 38 Packer/Shipper Q&A web meeting

Event Details


Tonasket Field Visit: Replant Management

Box Canyon Farm Block
Event Details


Rock Island Field Visit: Replant Management

WSU Sunrise Orchard
Event Details


Royal City Field Visit: Replant Management

Event Details

More Events

Featured Videos

Symptoms of X-disease Phytoplasma in Stone Fruit

X-disease in peaches, plums and nectarines causes yellow leaves, shot hole and small deformed fruit.

The Role of Dendrometers for Irrigation Management in Apple

This video is a recording of the webinar “The Role of Dendrometers for Irrigation Management in Apple” presenting information on the types and uses of dendrometer sensors and the data they collect. Includes discussion on…

Pear Rootstock & Systems Virtual Field Tour Webinar

“Pear Rootstocks & Systems Virtual Field Tour” webinar recording featuring the pre-recorded demonstrations, live presentations of research results, and live Q&A sessions with presenters and webinar attendees.

Quince Rootstock on Bartlett Pear Trial Virtual Tour

WSU’s Dr. Stefano Musacchi gives a virtual tour of his quince-Bartlett rootstock trial and discusses the research results and which combinations show the most promise for commercial orchards.

Quince Rootstock on Anjou Pear Trial Virtual Tour

WSU’s Dr. Stefano Musacchi gives a virtual tour of his quince-Anjou rootstock trial discussing the research results and which combinations show the most promise for commercial orchards.

Stemilt Bi-axis Pear Block Virtual Tour

WTFRC’s Tory Schmidt hosts this virtual tour of the Stemilt pear block that utilizes the bi-axis technique.

More Videos

Recent Publications

Apple Scion and Rootstock Contribute to Nutrient Uptake and Partitioning under Different Belowground Environments

Soil environment strongly contributes to tree growth and development, affecting nutrient and water uptake. Composite woody perennials, like apple, are a combination of two genetically different parts: a rootstock and a scion, and yet, the…

Optimization of Light Interception, Leaf Area and Yield in “WA38”: Comparisons among Training Systems, Rootstocks and Pruning Techniques

As apple orchards have transitioned to high-density plantings, proper training systems are required to manage increased leaf area. Leaf area index (LAI) is defined as the ratio between leaf area to ground area (m2/m2) and…
Image of fruit tree row in a compost treated orchard.

Compost Use For Tree Fruit

Compost can help improve soil quality and nutrient, water, and pest regulation. High-quality soil holds water and nutrients like a sponge, slowly releasing them over time to meet tree needs. High-quality soil can also suppress…

Soil Health in Orchards

Orchard soil health, or soil quality, is the capacity of soil to support productive trees over time without negatively affecting the surrounding environment. Soil health is influenced by interacting biological, physical, and chemical properties of…
lots of thick white fluff attached to the end of a small branch and hanging down

Perceptions and outcomes of conventional vs. organic apple orchard management

Highlights: Management goals were similar for organic and conventional apple orchards; Organic orchards employed more selective pesticide programs; Conventional and organic orchards did not differ in soil quality and insect counts; Integrated practices may be…

More Publications

Get Connected

Washington State University