Are all oak galls from wasps?

I know that they were crushed and used to make ink in ye goode olde days of yore.

I believe that plant galls can be caused by any number of irritants to the plant, they are essentially benign growths on the plant as a reaction to some type of irritant.

Most oak galls are caused by species of wasps, but some mites can cause them and various other irritants or damage to the tree can also result in a gall (though much less commonly than from the wasps).

A source of tannic acid for Chinese medicine too. http://www.itmonline.org/arts/gallnuts.htm

I think this discussion would be perfect on Jargon Pot Luck.