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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

Western X Questions and Answers. What do we know? What do we not know?

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It is critical that growers act now to aggressively manage Little Cherry Disease. Now, after harvest is the time to sample for infected trees and…

Post Harvest Little Cherry Disease Management

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As cherry harvest is finishing up, this is the best time to sample trees with small cherries for little cherry disease. The Little Cherry Disease…

Postharvest Defects & Honeycrisp Disorders Posters – on sale now!

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The long-awaited Postharvest Defects and Honeycrisp Disorders posters that were previewed during the December WSTFA annual meeting are now on sale. Posters sell for $35 each (cash…

Apple Export Training

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Each year a series of training workshops are held to inform the industry about changes to apple export work plans in general, as well as…

The Utility of Bitter Pit Prediction Models for Honeycrisp in Washington State

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Written by Ines Hanrahan and Marcella Galeni, Washington Tree Fruit Research Commission, June 2019.        At a Glance: Methods evaluated: Ethephon method; Passive method;…

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Featured Event

Columbia Basin Tree Fruit Club – July 23

Jul 23, 2019
Because we love to be outside at this time of the year, our next meeting will be a Field day at the WSU Roza research farm to show several ongoing research projects and meet with…

Upcoming Events


Columbia Basin Tree Fruit Club – July 23

WSU Prosser Roza Orchard
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Apple Exporter Workshop – Yakima

Red Lion Yakima Center
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Insect ID, Scouting and Management

WSU-Tree Fruit Research and Extension
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Apple Exporter Workshop – Wenatchee

Wenatchee Convention Center
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Featured Videos

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…

Northwest Profiles: Cosmic Crisp® (New Washington State Apple)

Bred from the marriage of two apples, and over 20years in the making…a once in a generation pome is destined to make a huge splash in the apple industry. Dubbed the Cosmic Crisp®, this apple…

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Recent Publications

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

Postharvest Dry Matter and Soluble Solids Content Prediction in d’Anjou and Bartlett Pear Using Near-infrared Spectroscopy

A. Goke, S. Serra, S. Musacchi. 2018. Hortscience 53(5):669-680.

Characterization of a novel self-incompatibility allele in Malus and S– genotyping of select crabapple cultivars

R. Sheick, S. Serra, P. De Franceschi, L. Dondini, S. Musacchi. 2018. Scientia Horticulturae 240:186-195.

Optimization of Leaf Area Estimation in a High-Density Apple Orchard Using Hemispherical Photography

A. Knerl, B. Anthony, S. Serra, S. Musacchi. 2018. HortScience 53(6):799-804.

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