Virginia Tech maps zones to restore endangered butternut
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- Virginia Tech published a study in Forest Ecology and Management mapping climate and soil conditions for restoring the endangered butternut tree (Juglans cinerea), a pale-wooded relative of black walnut.
- Butternut has nearly vanished from North American forests after butternut canker — an invasive fungal disease — spread across the landscape a century ago, pushing the species to endangered status on the IUCN Red List.
- Carrie Fearer, assistant professor in Virginia Tech's Department of Forest Resources and Environmental Conservation, led habitat modeling that identified southern Indiana, western Kentucky, western Michigan, and much of New England as prime regions for resistant butternut restoration.
- The models also pinpoint areas where naturally occurring hybrids — crosses between native butternut and disease-tolerant Japanese walnut — may already be helping the species persist in the wild.
- The project merged Virginia Tech with Purdue University's Hardwood Tree Improvement and Regeneration Center and the U.S. Forest Service, combining field sampling, disease-resistance screening, and computer modeling into a first-of-its-kind dataset.
- Butternuts are valuable "mast trees" producing large nuts that feed wildlife including turkeys, deer, and bears, making their decline a cascading loss for eastern forest ecosystems.
Why it matters: Forest managers now have a data-driven conservation map showing exactly where to plant resistant butternuts and collect seed across four priority regions, potentially reversing a century of decline for a species that feeds everything from turkeys to bears. Fearer says the same modeling approach could be applied to other native trees threatened by invasive disease and shifting temperatures, making the study a template for climate-adapted forest restoration.
