Since you've had no replies maybe you can supply more information. What crop are they on? Indoors or out?

The cyclamen mites were on six or eight delphinium elatum plants last year in one of my flower beds outdoors. Some of the leaves were blackened and curled, and flower buds blackened and distorted. Eventually some minor distorted and malformed flowers managed to push out but they were clearly infected. My local plant pathology lab confirmed the presence of cyclamen mites. There's no visible sign of them yet, but they do overwinter and this is the ideal time to treat them. Since these mites, unlike spider and most other mites, feed in the meristematic tissue inside the leaves rather than on the surface, they're much harder to control and are not even visible to the naked eye. They're probably the most pervasive and destructive pest of tall elatum delphinium in the US. Some sources have suggested the use of predator mites and am wondering if anyone has experience with those or any other remedies.