Oak Apples
I found these oak apples, or galls, on an oak sapling recently. Oak apples are caused by a gall wasp laying a single egg in a developing leaf bud on an oak tree. The wasp larvae feed on the gall tissue resulting from their secretions, which modify the oak bud into the gall, a structure that protects the developing larvae until they undergo metamorphosis into adults. Apparently this process seems to do little to damage the oak. Oak Read more…