The best control that I have found and read up on for spider mites, is to change the environment they love. So if it is hot and dry, make the environment moist, by spraying 2-3 times a week on the underside of the leaves. Spray bottle if small plant, for shrubs, garden hose.
When you have a somewhat moist environment, the mites hate it and move on. Then you don't have to use chemical, or DE. (I'm a big DE user) I just don't like using it on things that bees or other small insects might be on. As DE will also harm the Beneficial's.
just another 2cents for what it is worth.
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Jan
“Do what you can, with what you have, where you are.”
-Theodore Roosevelt
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