The Pennsylvania-Delaware Chapter of the International Society of Arboriculture was founded in 1960. The purpose of this organization is to foster a greater appreciation for shade trees and to promote the science, technology, and practice of professional arboriculture in the states of Pennsylvania and Delaware.


54th Annual Shade Tree Symposium

Thank you to all of the attendees and sponsors that made this year's symposium a great one.  Despite the weather, over 450 attendees came out to learn and network.

The 2020 Shade Tree Symposium will be held at the Lancaster Marriott on February 10th & 11th.



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Penn Del ISA membership provides you with access to exclusive resources and discounts. An investment in a chapter membership pays itself back through discounts on continuing education, access to exclusive resources and content, and educational benefits that will advance your career.

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2018 Board Meetings

March 23rd - Meeting in person: Location - Lehigh Valley area
May 3rd - Meeting in person: Location- State College area
August 10th - Conference call 9:00 am - 11:30 am
October 5th - Meeting in person: Pittsburgh area
December 7th - Meeting in person: at the 2019 Symposium site