CONTROLLING RED SPIDER MITES WITH PREDATORY MITES. Two-spotted spider mites and many others are the target food of P. persimilis, which will consume 5-10 pest adults or up to 20 pest eggs a day. This predator mite which comes from the sub-tropical regions is a lively shiny mite with a pinkish red color and has obvious long legs. When released during a low infestation, spider mites can be controlled within 2-3 weeks. P. persimilis need a relative humidity greater then 60% in order to survive, especially in the egg stage. Persimilis are most effective at tempertures ranging from 50 to 90 degrees F, but does best where tempertures remain below 85 degrees F. Once the adults' food supply dwindles, P. persimilis die. If reinfestation occurs, P. persimilis must be reintroduced, preferabley every 3-5 weeks, or in combination with either, G. occidenantalis or N. californicus. Available year round.