Hey guys I have had problems with caterpillars and other insects with my outdoor grow, and I did some research and found out that pyrethrum would be a safe insecticide to use that wouldn't effect my plants. The stuff that I bought is called "Bonide Garden Dust" and contains: Pyrethrins 0.03% Sulfur (4-5 microns) 25% Copper (basic copper sulfate) 5% and 69.97% inactive ingredients. However, this particular product is applied in powder form, and I was wondering if the powder will wash off by itself in the rain, it has been a week since I have used it and there are still traces of it left on the plants. The bugs are gone but I would like to know how to get rid of the powder because I don't want it on my finished product. Any input and advice is appreciated, thanks!