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Fruit trees

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OSU Extension offers research-based guidance to help Oregonians grow and manage healthy fruit trees at home or on the farm. We provide resources on variety selection, pruning, pest management and irrigation to support productive orchards and successful harvests.

Featured resources

Pest management guide for tree fruits: Hood River, The Dalles, White Salmon, Rogue Valley, Umatilla County

This annual guide provides tree fruit growers with the latest information on pesticides and herbicides for fruit trees. People who grow apples, pears and cherries can learn application rates and recommendations for each stage of tree growth.

Ashley Thompson, Achala KC, Jay W. Pscheidt, Nik Wiman, Christopher Adams, Andony Melathopoulos, Niall Millar, Robert Orpet | Mar 2026 | OSU Extension Catalog

Host range and characteristics affecting fruit susceptibility to spotted-wing drosophila

Spotted-wing drosophila thrives on various soft-skinned fruits, complicating pest management as they can move between hosts with different ripening times for a year-round survival and reproduction.

Vaughn Walton, Marco Rossi-Stacconi, Gabriella Tait, Dalila Rendon, Jana Lee, Rachael Nieri, Linda Brewer | Sep 2024 | OSU Extension Catalog

Latest news

Oregon State olive oil wins bronze at Los Angeles competition

First harvest from OSU research orchard earns international recognition.

Chris Branam | Mar 26, 2026 | News story

Olea project supports development of Oregon’s olive industry

Research helps growers choose hardy cultivars and reduce orchard risk.

Heather Stoven, Neil Bell | Mar 2026 | Impact story

OSU Extension helps lead X-disease response in cherries

Research and outreach help growers spot threats early and act fast.

Ashley Thompson, Niall Millar | Mar 2026 | Impact story

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Sweet cherry cultivars for the fresh market

This guide describes dark red and blush sweet cherry cultivars, including harvest timing, color when ripe, suggested pollinizers and rootstocks, size, firmness, yield potential, and other traits. Includes color photo of each cultivar.

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Photo Credit: Suzi - Adobe Stock (Cropped from original)

Cherry resources

Sweet cherry rootstocks for the Pacific Northwest

Cherry growers have many options when it comes to choosing rootstocks. The combination of new dwarfing rootstocks with high-density training systems leads to earlier production. But growers need to consider soil ...

Lynn Long, Clive Kaiser, Ashley Thompson | Feb 2026 | OSU Extension Catalog

Getting ahead of X-disease

X-disease has become a cyclic problem on the West Coast as outbreaks of X-disease emerge every 20 years or so. Understanding X-disease and identifying and removing infected trees will help break this cycle.

Ashley Thompson, Christopher Adams, Lauri Reinhold, Jay W. Pscheidt | Aug 2022 | OSU Extension Catalog

Growers adjusting methods for high-density cherries

Cherry growers in the Pacific Northwest and elsewhere have embraced high-density systems that put twice as many trees in the same amount of space. Here's a look at how their efforts are working out.

Lynn Long, Tim Facteau, Roberto Nuñez-Elisea, Helen Cahn | Mar 2024 | OSU Extension Catalog

Picking and storing apples and pears

For the best apples and pears, home orchardists and small farmers pick fruit at optimum maturity. Apples and pears harvested at the right time taste better than fruit picked at other times. They store better, too.

This guide to harvesting apples and pears will help you time it right.

Learn more

Credit: westermak15 - Adobe Stock (Cropped from original)

Latest resources

Pest management guide for tree fruits: Hood River, The Dalles, White Salmon, Rogue Valley, Umatilla County

This annual guide provides tree fruit growers with the latest information on pesticides and herbicides for fruit trees. People who grow apples, pears and cherries can learn application rates and recommendations for each stage of tree growth.

Ashley Thompson, Achala KC, Jay W. Pscheidt, Nik Wiman, Christopher Adams, Andony Melathopoulos, Niall Millar, Robert Orpet | Mar 2026 | OSU Extension Catalog

The cost of regulatory compliance in the Oregon tree fruit industry

Government regulations are often an overlooked cost of doing business for farmers. Here's a detailed look at how much state and federal regulations cost per acre for four Oregon fruit growers.

Tim Delbridge, Ashley Thompson, Mike McCullough | Nov 2025 | OSU Extension Catalog

Pest management schedules for fruit trees in Eastern Oregon

What do you need to do when to protect against diseases and insect pests for your apple, cherry and stone fruit trees? We have the answers for people who live in Eastern Oregon.

Cody Copp | Mar 2025 | OSU Extension Catalog

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Meet Our Experts

Ashley Thompson
Ashley Thompson
Associate Professor of Horticulture

Contact for questions about commercial cherry and pear production in Wasco and Hood River Counties.

Nik Wiman
Orchard Crops Specialist
Erica Chernoh
Horticulture Assistant Professor of Practice, Commercial and Community Horticulture, Master gardener
Christopher Adams
Christopher Adams
Assistant Professor
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White spots from watering with hard water?

P: I’ve been suspecting for the last few years that a large problem for our garden and orchard is our hard water. Once I start introducing water from our irrigation, after the spring rains have dried up, the leaves curl, ...

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