If you have ants farming your aphids it could work to keep them out. I tend to put around the bottom of the plant and lower stem. I use drip irrigation so only washes away when it rains. Randy On Thu, Dec 8, 2011 at 3:01 PM, Bulborum Botanicum <bulborum@gmail.com>wrote: > I thought maybe it would be good to test against aphids > > Roland > > > > -- * * A long habit of not thinking a thing wrong gives it a superficial appearance of being right. - Thomas Paine --- * *