These galls may occur on Oak leaves or catkins After mating the fertilised eggs are laid by the sexual generation in the lower epidermis of the Oak leaves The Spangle Galls develop over the winter and the insects emerge in April, laying their eggs in the catkins or lower epidermis of leaves1/4/12 · Bur oak (Quercus macrocarpa) Found in the northeast Great Plains 15 inch (4 cm) acorns with a cup that covers more than half the acorn Post oak (Quercus stellata) Found in the Cross Timbers region No more than ¾" (19 mm) long, light brown;Oak Spangles resemble small buttons on the surface of oak leaves Other waspinduced leaf galls on oak resemble blisters, beads, or fuzzy balls Many times these galls, also called Oak Button Galls, will fall from the tree and land on cars, decks, and sidewalks below, making a sticky mess Oak button gall Image What Are Oak Apple Galls How to get rid of oak leaf galls