Im not sure about beneficial but I had a bunch that meet your description which were not beneficial at all. They were attached all over a carnation which caused it to wilt away to about 25% of it's origional size. I had to dip it to kill them off and I haven't seen any return since. I still have no clue what they were but they match what you are describing.
Last edited by FlamesFan; 03-17-2009 at 11:28 PM.
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