Live Oak Leaf Galls

Description:

Galls are formed when an insect (in this case a type of tiny wasp) lays an egg just under the surface of a stem or leaf. A gall is formed because the tree is stimulated by the presence of the egg, and eventually the hatched larvae, to grow a structure around the wounded area. Galls are very common in oaks and are not considered harmeful to the health of trees.

Habitat:

Oak tree leaves