With mites the argument is to go with tomato dust (sulphur), pest oil, then natrasoap in order of increasing strength. It's all crap.
The other argument is that they thrive on dry conditions so leaf watering is an idea, increasing humidity and making the mites uncomfortable, but increasing all other problems in the meantime. It's crap. Never ever water tomato leaves.
Go the sledgehammer. Specific miticide. Active ingredient Dicofol, but trade name Kocide.
Once a year about now. On tomatoes, stone fruit, marigolds, anything that gets speckled leaves. It just has to be done.
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