Insect and Spider Identification: CLOSED: Black bugs that look like pepper, everywhere! Petunias, 1 by uhlyduhb

uhlyduhb wrote:
I'm sad to say that I my favorite petunias are under attack. I need help identifying what these little bugs are because the insectide I have isn't doing any good. (I'm using Triazicide insect killer). These bugs seem to be all shell. They leave a yellow circle when removed, as if they were sucking the green from the leaf.

Can you offer me any advice on how to remove these suckers? (pun intended) :)
Thanks so much for your help.