Miticides are used to control Mites which are among the most difficult arthropod pests to control on ornamental plants. Adult mites have eight legs and piercing/sucking mouthparts that are used to suck fluids from the cells of host plants. The first immature stage of a mite, referred to as the larva, has only six legs, like insects. The exceptions are the Eriophyid mites, which have four legs in all stages. Mites are not insects, but are more closely related to spiders and ticks. Thousands of species of mites feed on plants.