Dr. Bronners Peppermint Soap

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Yes its a very easy insect spray to make, I think some people don't get good effects because they use water with too much dissolved solids. Anionic surfactants like castile soap precipitate and become less effective and more phytotoxic when diluted in hard water. Some people may also spray when leaf temps are too high which can also cause phytotoxicity with any surfactant. Works well on spider mites too!
 

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