Why the Tree of Heaven Spreads So Quickly and Harms Forests in PA

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...

Click here to read the full story.

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