In this Philadelphia Inquirer story, Eric O'Neal of Davey's North Philadelphia office discusses his research on the invasive tree of heaven, which is prevalent in Philadelphia and Pennsylvania.
Posted: August 3, 2017
The Ailanthus altissima, or tree of heaven, is an invasive species that’s taken root in Pennsylvania forests, crowding out native trees, damaging urban infrastructure, and hosting a crop-afflicting insect.
And it has bedeviled foresters trying to get rid of the tree, which first was imported to the Philadelphia area in the 18th century.
Now, thanks to a former Pennsylvania State University student, we know why it’s been so tough to control...