Genetic techniques aim to revive American chestnut

The American chestnut tree, once a defining presence in Appalachian forests, fell from its dominant position after the arrival of an invasive pathogen. In the early 20th century, the chestnut blight fungus, *Cryphonectria parasitica*, was inadvertently introduced from Asia and spread rapidly across the eastern United States.

The blight infected the trees’ bark, forming cankers that eventually killed the majority of mature chestnuts. Within a few decades, the species that had provided food, shelter, and economic value to countless communities was largely eliminated from the region. Efforts to restore the chestnut through breeding resistant strains and biocontrol measures have met with limited success, and the species remains a cautionary example of the ecological consequences of introducing non-native pathogens.

Today, the American chestnut’s loss is still felt in Appalachian ecosystems, where its absence has altered forest composition and wildlife habitats. Conservationists continue to monitor and support research aimed at reintroducing a resilient chestnut, hoping to restore a key component of the region’s natural heritage.