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WSU Puyallup Ornamental Plant Pathology

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Contact: Gary Chastagner, 253-445-4528 | WSU Puyallup Research & Extension Center, 2606 West Pioneer, Puyallup, WA, 98371-4998 USA
Last updated January 2, 2013

Pacific madrone survey

We are creating a database to update the madrone distribution map and learn more about the health condition of the species throughout its range.

For details about the data and representative photos to help you complete the survey, download the Pacific Madrone Assessment Guidebook, then complete the survey using one of the methods below.


We are primarily collecting data using the TreeSnap smartphone app. However, two other methods to contribute are listed below.


TreeSnap is a smartphone app. Data can be uploaded later if internet connection not available in the field. Visit the Arbutus ARME webpage for more information about using the app.

Instructions: Youtube video on how to use TreeSnap (~5 minutes).

Other ways to share observations

  1. Download the paper survey, complete, and return to WSU either by scanning/emailing, entering data in the webform on your computer, or snail mail.
  2. Webform – upload observations using your web browser (must have internet connection).

Pacific Madrone Research

Pacific Madrone Research


Welcome to the WSU Pacific Madrone Research webpage!

The purpose of this webpage is to highlight the aim of our madrone research, describe our ongoing projects, and share important information for conserving the Pacific madrone.

We also invite you to participate in our research by joining the Arbutus ARME and subscribing to our newsletter. More information is available below, but feel free to contact us if you have any additional questions.

Pacific Madrone

Pacific Madrone

Madrone (arbutus, madrona or madroño) is an important tree in the Pacific Northwest because of its cultural and ecological value. For example, madrone is an important part of our cultural heritage because the berries were used widely as a food source or even as bait for steelhead fishing. Ecologically, Pacific madrone is an important pioneer species and its tolerance to salt water allows it to occupy many areas that would erode otherwise. Click here to learn more about Pacific madrone.


Madrone is a keystone species of the Pacific Northwest. Current populations range from the coast of central California into southern British Columbia. However, the distribution of Pacific madrone is expected to shift with changes in climate. Click here for more information about the distribution. Additional information about some of the region’s Champion Trees is also available here.


Research Aim

Research is critical to advance knowledge and conserve the madrone in the Pacific Northwest. Populations of this keystone species are already under threat from changes in the climate and pests and diseases. For example, madrone leaf blight is a major disease affecting madrone in western Washington and Oregon. In this regard, identifying populations that are most tolerant to leaf blight is a priority for our research program.

One of the primary aims of our program is to promote the health and sustainability of Pacific madrone. There are two ongoing studies designed to help accomplish this aim:

Common Garden Study

Madrone trees from various seed sources, collected throughout its range, were planted at sites ranging from California to British Columbia. These ‘Common Gardens’ are monitored annually to identify the genotypes best suited for each region. More information about the study is available here.

Pacific Madrone Survey – We need your help!

You’re invited to join the Arbutus ARME and contribute to research about the range and health conditions of Pacific madrone! These data will be valuable for identifying vigorous trees with resistance to leaf blight in wild populations and monitoring for the emergence of novel threats, such as new pests and diseases. Anyone is welcome to participate.

Additional resources and research outcomes of our program are available here.

Arbutus ARME


The Arbutus ARME is a ‘citizen science‘ program that was established through a partnership between WSU and Seattle Parks and Recreation in 2019.

Contribute to Research!

You can contribute to research to advance knowledge and help conserve the Pacific madrone.

Join the Arbutus ARME

Visit our Arbutus ARME webpage to join the Arbutus ARME and subscribe to the newsletter.

More Information

Contact us for more information, research updates, or to learn about the opportunities to contribute.


Previous Events

“The Future of Pacific Madrone” Mini-conference held April 19-20 2016 at WSU Puyallup.

Upcoming Events

Check back soon or contact us about upcoming events to learn more about our Pacific madrone research or the opportunities to meet others in the Arbutus ARME.

Social Media

The Council Madrone

The Council Madrone

750_Council madrone“The Council Madrone was located upslope from the Mattole River in Humboldt County, California. In this photo are Dr. Frank A. Lang and Frank Callahan (w/o the sunglasses) along with Frank L.’s dog. This tree’s last measurements before its demise during a wet snow event are given as follows: 13′ DBH Height 100′ and 115′ crown spread. In short the Council Madrone has about twice the wood volume as Washington’s Port Angeles tree.

The largest Pacific madrone that I have ever encountered was a tree that was 14′ DBH growing on Cleveland Ridge, Jackson County, Oregon and was in decline and cut for firewood – the tree (from memory) branched ca. 25′ above the ground into multiple very large trunks. The woodcutters remarked “the tree yielded over 14 cords of wood”. I think the tree was ca. 125′ tall – at the time of its demise. Of interest, this madrone did not have basal sprouts, and the center was hollow exhibiting ca. 4′ x 5′ cavity. We were unable to determine the age of the tree but suspect it was in the 800 year range – as you may know madrone rings are very difficult to count.”

Photo and information about the tree courtesy of Frank Callahan.

Contact: Gary Chastagner, 253-445-4528 | WSU Puyallup Research & Extension Center,2606 West Pioneer, Puyallup, WA, 98371-4998 USA

The Oregon Champion madrone

Contact: Gary Chastagner, 253-445-4528 | WSU Puyallup Research & Extension Center,2606 West Pioneer, Puyallup, WA, 98371-4998 USA