at least this is what my DH calls them....the last three years they or their progeny have destoyed my autumn clematis...gets to the blooming stage and then all of a sudden the whole thing is stubs...this year I tried Neem on them,sprayed thoroughly three times and these are huge vines that run 8-10' down our fence....still chawed to death. Any suggestions? Prefer organic methods but geting desperate. We pruned them back last year and burned all the foilage to see if that would help but apparently not! DEE