What is a biological control of red spider mites on orchids?

The mealybug destroyer [Cryptolaemus montrouzieri], one of the ladybugs, is an effective biological control of mealy bugs [Pseudococcus dendrobiorum] on orchids ... and any other plant under mealy bug attack. This particular ladybug prefers a diet of mealybugs. It's as effective as the most powerful of insecticides against target pests. But it's without harmful side effects to non target populations in the garden.