Predatory mite. Coloured scanning electron micrograph (SEM) of a Phytoseiulus sp. mite. This mite is used as a biological control animal against all stages of red spider mites. An infestation of red spider mites can severely damage plants by feeding on their sap. The Phytoseiulus mites are used as an alternative to chemical pesticides. Magnification: x150 when printed 10cm wide.