if you have a tank-type vacumn cleaner you can suck off most of the critters easily and without spraying anything on your nearly finished flowers. just place the nozzle near the flowers with fingers covering the end (or place a piece of screen, anything to keep from sucking in plant matter) and carefully move nozzle around and under leaves(easiest with 2 people). when done squirt a little bug spray into the nozzle (use something strong, like raid or black flag...ya don't want em crawling out of the tank) then put away for a couple days. after a week or so of doing this every 2nd-3rd day you won't see them and there'll be no poisoness residue on your flowers...