I've never had success with DM in controlling any pest, to be honest.
For controlling russets you want to use something that kills all stages of them, that's why I like the lavender and citrus sprays, but if they are even moderately into flowering it'll work poorly because the mites are so tiny.
That's why dips work the best.
Russets are easily killed with sprays, and they don't reproduce nearly as fast as spider mites.
BUT you have to spray them at longer intervals, at least ten days, where spider mites you can control in about 6-8 days.
flowering ladies with mites I doubt you'll actually eliminate them, more likely you'll just slow them down hopefully to the degree where they don't totally screw your flowers.
ANYTHING that turns brown or tan on my plants and I am all over them.
In my experience nothing makes the plant do that except mites. Heat damage doesn't turn the same color, that's more of a lighter green and it will yellow eventually.
russets are a tan or brown color on the growing tips or calyxes.
And you won't see them at all, nor will they "smear" like two-spots do (meaning when you rub the leaves you won't feel the mites "smear" between your fingers)
clean leaf, any lavender based spray (for mites that is), fermented comfrey/dandelion, compost teas will help knock them back.
If it's bad and in the vege time, and you don't mind using miitcides, avid works also. I don't recommend that though.
