My personal pest spray is 1 gallon of water, 1 tablespoonish of dish soap, and one cuppish of isopropyl alcohol. I'm yet to see it damage a plant and it kills most arthropods on contact through various scientific things that are complicated and thrilling. I've not tried it on caterpillars but I'd have to imagine it would work to at least some degree.
this post was submitted on 20 Jun 2023
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Container Gardening
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That's pretty much exactly my recipe too. I put it in old window spray bottles