Need an all rounder organic solution to pests
I have several herbs, rocket, basil, mint and they all seem to be affected by rust (but I am a novice so could be wrong). I want to keep them alive in a organic way as I use them for cooking. My additional complication is that I live in China and distrust local products that may just be "labelled" organic, so ideally a 'famous organic all round pest solution' might be available here or I might be able to source from friends / family at home.
Any suggestions would be welcomed.