Blacksburg, VA, Apr 7: Virginia Tech researchers are offering hope for the endangered butternut tree, a close relative of black walnut, long threatened by an invasive fungal disease. Using advanced data science, the team has identified regions across the Midwest and New England where disease-resistant butternut populations can thrive, guiding future restoration and conservation efforts.
Once common across eastern forests, butternut trees have been devastated by butternut canker, an aggressive fungal disease. By combining climate, soil, and genetic data, Virginia Tech, in collaboration with Purdue University and the U.S. Forest Service, developed predictive maps highlighting where naturally resistant trees and hybrids are most likely to survive.
Key Findings:
- Prime restoration regions include southern Indiana, western Kentucky, western Michigan, and much of New England.
- Naturally occurring hybrids, crosses between native butternut and disease-tolerant Japanese walnut, may already be contributing to species persistence.
- Insights on temperature, precipitation, and soil carbon conditions provide actionable guidance for forest managers to prioritize conservation and planting efforts.
Carrie Fearer, assistant professor in Virginia Tech’s Department of Forest Resources and Environmental Conservation and senior author of the study, said,
“Butternut has nearly vanished from our forests due to an invasive fungal disease, but some individuals have natural resistance. By understanding the conditions that support these trees, we can focus conservation where it will matter most.”
Butternut trees are valuable “mast trees,” producing nuts that sustain wildlife including turkeys, deer, and bears. Their decline has significant ecological implications for forest composition and biodiversity.
Aziz Ebrahimi, research scientist at Purdue University, added,
“By combining field sampling, genomic analysis, and climate-based habitat models, we created a practical tool for guiding seed collection, regeneration orchards, and restoration planting for this endangered tree.”
The study, published in Forest Ecology and Management, underscores the importance of cross-institutional collaboration and open data sharing in tackling complex ecological challenges. The approach also provides a framework for conserving other native tree species threatened by invasive diseases and shifting climate patterns.
Fearer emphasized,
“We can’t move trees everywhere, but we can predict where they’re most likely to succeed. This research gives us a roadmap for restoring not just butternut, but resilience to our forests.”
