I expect its because the hairs discourage ants from climbing up the stems and so they do not graze their aphid "cattle" there. I have found any really effective aphid control also includes ant control (I use Grant's Ant Stakes in all my potted chiles.) Peace, love and peppers Lorraine On Wed, 8 Jul 1998, Robert Farr, Chile Man wrote: > I also notice that my chiles plants with hairs - such as Manzano Rojo or > Rocoto - don't have aphids, but the rest do. > > Any ideas why? > > And what kind of control works BEST?? I've tried insecticidal soap - > even daily application is having difficulty controlling the aphids, and > my plants are the worse for wear because of the soap. The garlic/pepper > spray works okay - but it also contains soap. > > Help!! > > TIA, > > Robert. >