These hunting wasps can be important in controlling Garden insect pests. For example, the common Polistes paper wasps, when hunting, may thoroughly search plants and feed on caterpillars, often providing substantial control of these Insects. Several mite species are predators of plant-feeding spider mites. Typically, these predatory mites are little larger than spider mites but are more rounded in shape and faster moving than their prey. Predatory mites often can provide good control of spider mites.
Low humidity can restrict their activity.
They are also more susceptible to insecticides than are plant-feeding species. All spiders feed on Insects or other small arthropods. Most people are familiar with many common web-making species. These less conspicuous spiders can be important in controlling insect pests such as beetles, caterpillars, leafhoppers and aphids. These flies are rather undistinguished-looking gray or brown flies covered with dark bristles.