Apple oak galls on a swamp white oak (Quercus bicolor), photo by Jodi Green, Extension Entomologist
by Taylor Cammack, Extension Educator While doing some work around the yard, I came across the weirdest thing on the leaf of a red oak – a green bulbous growth on a leaf!
This weird structure is an oak apple gall, caused by a gall wasp. The gall itself is round and can sometimes turn red like an apple, hence the common name. These galls are found on oaks, and most commonly on red (Q. rubra), black …
