Here's one Jon. Although I don't think it mentions the reds in this one. In my experience, the Blacks have been taking the hit hard and the Reds not so bad.
http://www.pollyhillarboretum.org/wp-content/uploads/2012/08/Crypt-Gall-Wasp-Tree-Care-Industry-March-2013.pdf
These Galls are not the standard bullish galls. The larvae from the wasp tunnels along the branch tops creating the gall. It is my understanding that the saliva from the larvae changes the DNA in the tree and tells it to produce less leafy material and more woody material. The limbs grow wood so...