I have bunches of aphids. I keep them under control by spraying left over dish water (dishsoap and water). Where ever I spray when I go out the next day the aphids are dried up and dead. I don't mind using dishsoap water because I wash the tomatoes in that (and rinse of course) before I eat them anyhow. Essentially it is a cheap alternative to insecticidal soap.
Weather has a lot to do with it. Last year it was dry and no aphid problems. This year it's wet and I have aphid problems. I grow everything from seed so no contamination from outside sources. Some plants are more affected than others.
Good luck.
Randy
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