Persimilis predatory mites Phytoseiulus persimilis is a predatory mite that feeds only on two-spotted spider mite adults, nymphs, and eggs. Because spider mites are their only food source, Persimilis are best introduced when spider mites are first discovered, rather than preventatively. Once they exhaust their food source they will disperse... Persimilis predatory mites Phytoseiulus persimilis is a predatory mite that feeds only on two-spotted spider mite adults, nymphs, and eggs. Because spider mites are their only food source, Persimilis are best introduced when spider mites are first discovered, rather than preventatively. Once they exhaust their food source they will disperse...