Mind you, when I first discovered the aphids I mashed a few of them on the leaves...and sprinkled some culled basil leaves, crushed around the soil under them (don't ask me why, it was a whim/hunch kinda thing).
Does basil make aphids turn red? Have I discovered a new property of basil juice? ::giggle::
I mashed the red ones, too, that I could find, and sprinkled more basil leaves throughout. Here's hoping it works!