I found a massive infestation of what I think are leafhoppers on my crepe myrtles the other day. I sprayed them w/ insecticide b/c I freaked there were so many. It might have even killed a few. What do I use on these buggers??!! And what kind of damage do they do? I also have billions of what I guess are whiteflies. They look fluffy or like they were rolled in confectioners sugar when on the leaf and there is a powdery white residue on the leaf? I've been squishing them. Now, it may be two different bugs b/c now I'm seeing very very teeny flying white specks. Are the 1st some kind of aphid or what and what do I do about these things? Are they going to eat my garden? If not, they can stay. HELP!!!??