|Callirhytis furva - R. Curtis|
|Acraspis erinacei - Charley Eiseman|
The life cycle is a bit complicated. The process begins when a fertilized female lays eggs on an oak leaf. The hatchlings cause some damage and the leaf responds by creating the gall around them. The gall contains three to five larval cells, each holding a female that will emerge in the fall and lay eggs on leaf buds without mating. After being exposed all winter, the larvae stimulate other galls, and adult males and females will emerge to mate and start the cycle over again.
The gall looks delicate but don't let that fool you. Cutting through one with a razor blade requires a lot of pressure. What you see is below.
|Opened gall- REK|
|Gall larva with toothpick - REK|
* Tracks and Signs of Insects and Other Invertebrates: A Guide to North American Species