One of the two stately horse-chestnut trees, which have been landmarks on Canyon Road for nearly a century and a half, appears to be dead. Both trees began showing signs of stress, such as rust on ...

Cameraria ohridella, an invasive moth species, has emerged as a significant pest affecting horse chestnut trees (Aesculus hippocastanum) across Europe. The larvae of this leaf miner penetrate and feed ...

Joe Stavish, Tree Pittsburgh’s education director, often takes to social media to teach people about trees. On an early December morning, about a dozen people joined him in person to learn to identify ...