My maple tree's leaves are growing spikes/thorns?

It looks like a fungus/infection type of thing, and every leaf has like thorns or spikes growing vertically out of it it looks putrid. Any help?


These are probably maple leaf galls, caused by a mite. They make the leaves look ugly, but they really don't hurt the tree. See the link for more.


It's most likely the work of a gall wasp. Galls by these wasps do no direct harm, they just look unsightly. There is nothing you can do about them, unfortunately, just wait for the leaves to fall.