I had a type of true bug the Four-lined Plant Bug this spring and last year that were on my perennials. These bugs were just decimating the flower buds and new growth tips.
http://www.tomatoville.com/showthread.php?t=36885 I used Dr. Bronner's Pure-Castile Soap with very good results. The only problem with it was that these bugs can fly and mine were quite shy and moved quickly. The soap has to cover the bug or it is ineffective. I do not like to spray my whole garden because I don't want to harm my beneficials. So then you have to be on the lookout and keep a spry bottle with you to spray as found.