Anyone know what does this?

[Ross]

The really effective spray for mites is one of the registered miticides such as Kelthane. They are hard to find as they are pretty toxic. All of the mixed spays that say they control mites only reduce the populations - not elliminate them. They are targetted for crops and other annuals where the plant only has to survive the season. Do a search for miticide or kelthane and see what comes up. By the way, the mites probably aren't gone, just between populations - eggs still probably exist and anothe population may apear. There are several good oils available for controll of scale. Try to find one that won't upset orchids.