and there's a mechanical method for controlling them during flowering and pre-harvest when soap solutions and insecticide's are not to be used...the tube vacumn and suck em off, webbing and any adults and hatchlings! i have only had the need once but am very glad a net-friend mentioned this method as it saved a crop nearing harvest that was infested from a store-bought houseplant being brought into the house, even though it was nowhere near the garden they got transported to it via our clothes...