UDK transparent parts flickr white

Behema

I cant get rid of this white flickering around the ferns in my scene. they show up at certain angles and they're really annoying! Any ideas how to fix them. On the diffuse map where the white shows, there is a dark green so the white makes no sense. and on the spec map I even made that area black in hopes of fixing it.

Oops this probably needs to be moved the UDK specific tech thread