I was lucky and found some safer product- unable to find a pyrethrin this late in season- used safer 2 days ago and immediately noticed decline in adult white flys - this AM looked at infested garden , with backlight- this lighting helps see the tiny flies- saw a few will spray again in 2 more days- I was surprised that only an hour after application there was no smell of product at all- hopefully I will be able to eliminate completely next application