Hiker's Guide to the Trees, Shrubs and Vines of Ricketts Glen State Park (PA)

Hiker's Guide to the Trees, Shrubs
and Vines of Ricketts Glen State Park

Red-Black Oak "Apple" Gall Caused by the
Cynipid Wasp Amphibolips cookii

Identification by Dr. Carol Mapes, Biology Dept., Kutztown Univeristy of PA.

Updated 25 October 2017.