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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.

Recent News

PNW Pear Industry Input Sought Regarding Potential Initiation of New Breeding Program

Published on
The research subcommittee of the Fresh and Processed Pear Committees (FPC/PPC) is seeking feedback from pear industry stakeholders regarding the opportunity to support a new…

Introducing the WSU Pesticide Spray Record Evaluator

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At some point, many of us have heard from a grower or friend that “it’s been a really bad year” for the control of a…

County Horticultural Pest and Disease Boards in Washington State

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Every county in Washington State that has commercial tree fruit operations that ship fruit to specific countries outside the United States are required to have…

Tree Fruit Soil Fertility and Plant Nutrition in Cropping Orchards in Central Washington

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Healthy trees need healthy roots to take up water and nutrients; healthy soils to provide water, nutrients, and protection from plant pathogens; sufficient water; and…

Canker Removal Now is Critical for Fire Blight Management this Year

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Fire blight cankers left in the orchard are the source for new infections next spring. Remove them now!

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Featured Event

2020 Apple Horticulture/ Postharvest & Apple Crop Protection Research Review

Jan 29, 2020
The WA Tree Fruit Research Commission would like to invite everyone interested to attend this year’s Apple Horticulture / Postharvest and Apple Crop Protection Research Reviews.

Upcoming Events


NCW Apple Day 2020

Wenatchee Convention Center
Event Details


Manejo de Frutales

Wenatchee Convention Center
Event Details


NCW Pear Day 2020

Wenatchee Convention Center
Event Details



Event Details


Columbia Basin Tree Fruit Club – January

Cousins Restaurant
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Featured Videos

Taking time when testing WA 38 (COSMIC CRISP®) maturity

Ines Hanrahan, executive director of the Washington Tree Fruit Research Commission, shows differences in testing apple maturity between Granny Smith and WA 38 (COSMIC CRISP®) using an iodine starch test. Learn more about the recently…

Para mejorar la calidad de fruta, utilice el análisis de suelo

El análisis de suelo es fundamental para el manejo de la nutrición del huerto. En este video, Bernardita Sallato nos muestra cómo tomar la muestra de suelo en un huerto frutal.

Netting for Apple Insect Management

Shade nets are becoming popular to reduce sunburn on apples, but what effect do they have on movement of insects? WSU graduate student Adrian Marshall is investigating the potential of mesh barriers to keep pests…

WA 38 Fruit Quality Update 2019

Dr. Ines Hanrahan, Executive Director for the WA Tree Fruit Research Commission, presents information about WA 38 fruit quality studies including recent results and future plans. This presentation was part of the 2019 Apple Day…

WA 38 Horticulture Update 2019

Dr. Stefano Musacchi, Endowed Chair of Tree Fruit Physiology & Management at WSU, discusses the most recent information about the best horticultural practices for WA 38 apple trees and updates on related research. There is…

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Recent Publications

Fire blight in the plant nursery

This article discusses recommendations for preventing fire blight from arriving in your nursery, and for cleaning up the disease, should infected plants be detected there.

The Modern Apple Orchard: What does it entail?

Modern tree fruit orchards are planted with a goal of maximizing efficiency and productivity. Mechanized operations are ideal for high-value, large operations to increase profitability. Consequently, there has been a steady increase in sparsely-branched thin…

Responses of ‘Honeycrisp’ Apples to Short-term Controlled Atmosphere Storage Established During Temperature Conditioning

‘Honeycrisp’ apples are susceptible to bitter pit, a physiological disorder that impacts peel and adjacent cortex tissue. ‘Honeycrisp’ is also susceptible to chilling injury (CI) that can be prevented by holding fruit at 10 to 20 8C…
4th leaf WA38 regraft with full 2-d canopy and full crop.

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…

Use of Protective Netting in Washington State Apple Production

G Mupambi, D Layne, L Kalcsits, S Musacchi, S Serra, T Schmidt, and I Hanrahan. 2019. TB60E. WSU Extension Pubs. Washington State (WA) is the largest producer of apples in the United States. The major…

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