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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

Seeking comments for EPA re: use of paraquat

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The EPA is currently conducting a registration review of paraquat dichloride, and has released draft human health and ecological risk assessments, which can be found…

What Specialty Crops Might Thrive in the Northwest in the Future?

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Specialty crop production, like virtually all agricultural systems across the region, will be challenged by climate change. Over the coming decades, the Northwest is projected…

Upcoming Events for Next Generation Tree Fruit Network Nov 13 and Dec 4

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The Next Generation Tree Fruit Network began in 2016 as a partnership between the WSU Tree Fruit Extension Team and young growers. Supporting the future…

2020 Produce Safety Alliance Grower Trainings

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The Produce Safety Alliance (PSA) was tasked with developing the standardized national produce safety training program to prepare fresh produce growers to meet the regulatory…

Under Pressure – Pressure gauge practices for sprayers

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This time of year many growers are exchanging their daily use machinery away from orchard management tools and into harvest equipment. This is also an…

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Featured Event

Next Generation Network: Looking Ahead at Market & Economic Trends

Dec 4, 2019
Join us for dinner and a panel discussion. Sam Godwin of Chelan Fresh and Roger Pepperl of Stemilt Marketing will share perspectives and answer questions on future market and economic trends for tree fruit. Directions…

Upcoming Events


Next Generation Network: Looking Ahead at Market & Economic Trends

Chateau Faire Le Pont
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Pear IPM Season Review and Planning

Mission Creek Community Club
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CORE in the Gorge – Hood River, OR

Columbia Gorge Community College
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CORE in the Gorge – The Dalles, OR

Columbia Gorge Community College
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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

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…

Protective Netting Improves Leaf-level Photosynthetic Light Use Efficiency in ‘Honeycrisp’ Apple Under Heat Stress

G Mupambi, S Musacchi, S Serra, L Kalcsits, D Layne, and T Schmidt. 2018. HortScience 53(10): 1416-1422. DOI: 10.21273/HORTSCI13096-18

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