These are NOT chewing insects - and BT only works on that kind of bug (catepillars, worms, leaf hoppers etc) - they take one bite, decide to eat elsewhere and are dead within a couple of hours anyway... these are sucking insects which need a different solution.... And please, also do not fall into the neem oil trap (not that anyone has suggested it so far!) ... it's not very effective in my experience and can't be used during flower...