The leaves on my roses have been turning brown. Originally there are brown spots and eventually the whole leaf is brown and is very thin. Tonight I did find a couple of caterpillars on the back of the leaves; I don't see a lot of them though. My roses have done this before. They seem to come back and bloom again later in the summer and are fine the next spring. Pictures are the beginning stages, then leaves that are completely brown and then the caterpillars.