I've got a lot of autumn clematis on the front of my home. For the last 2 years we've gotten these gray/tan bugs that eat all the leaves and most of the flowers. They show up right after the clematis starts blooming. They are about 1/2 inch long (kinda big for a bug) and have wings. Don't know what they are so don't know what to use to get rid of them. They seem to leave everything else alone (roses, wisteria, daylilies, etc.). I"ve got pictures but don't have a website to post them to. At any rate, they eat all the way through the clematis in about 7-10 days leaving only the branches and no leaves/flowers whatsoever. Any ideas?