Field Notes: A Galling History
December 19, 2017 - by Urban Forest Conservationist Jim McGlone While leading a forest hike with a landowner and group of her friends, I was brought to a small group of pin oaks that had many of the growths pictured here. The landowner was concerned that it was a disease that would spread and kill all her trees. This growth, and others like it, are called galls. Galls form when an insect, usually a small... Read More