Well from what ive seen it does have a nasty little affect of the ability to collect sunlight, cause it coats it, but im bot sure if my tomatos just shaded over the younger leaves and blocked it over the limit or it was all the stuff. Anyway it washes off so once you get a good coat on there and the bugs seem to die back alot wash it off. Umm so far i havent had them come back, but also my plants have gotten giant so im sure i wouldnt even notice a few bugs. Id guess that once you get better control over the bugs , natures steps in and handles the rest. Good luck with em man