Cryphonectaria parasitica (also known as Endothia parasitica)

Cryphonectria parasitica, also known as Endothia parasitica, is a fungal pathogen that causes chestnut blight, a devastating disease affecting American chestnut trees. The fungus infects the bark, creating cankers that weaken and often kill the trees by disrupting nutrient flow. It spreads through spores, especially in wet conditions, leading to rapid decay of infected tissues. The disease dramatically reduced chestnut populations in North America in the early 20th century. Managing the disease involves removing infected parts and breeding resistant tree varieties. Despite efforts, chestnut blight remains a significant threat to chestnut ecosystems and forestry.