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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

Recent Research on the Use of Apogee and Early Calcium Sprays to Suppress Bitter Pit in Honeycrisp

Published on
Dan Donahue and colleagues with Cornell Coorperative Extension in in eastern New York State began studying the Honeycrisp bitter pit issue in 2016.  Their objectives…

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…

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Featured Event

Agricultural Technology Day – Automation in Specialty Crops

Aug 22, 2019
WSU’s Center for Precision & Automated Agriculture Systems (CPAAS) will host Agriculture Technology Day at the WSU IAREC-Prosser Ag Tech Building from 1:30pm to 6 pm August 22. Experts from WSU, the Washington State Department…

Upcoming Events


Agricultural Technology Day – Automation in Specialty Crops

WSU – IAREC, Prosser
Event Details


Taiwan Orchard-Bin-Cull Sampling – Brewster/Chelan

Gebbers Farms- C Line lunchroom
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Next Generation Network: Fruit Breeding 101

WSU Columbia View Orchard
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Next Generation Network: New Technology for Efficient Harvest

Chateau Faire Le Pont
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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

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

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.

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