I have been using ashes from either the fireplace, or BBQ. I dust the aphids with the ash, then come back in a couple of hours and hose off all of the dead aphids. Sometimes, I have to repeat treat in a day or two. I have had near 100% success with that simple, organic method. The ash might slightly raise pH, but is helpful to the soil. Left untreated, aphids will demolish all new growth!
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