Their pest importance is magnified because of their small size, their rapid reproduction, and their ability to develop pesticide resistance. Of the mites you may encounter, the two-spotted spider mite is the most important. Two-spotted spider mites. I have selected this mite as a typical example. This mite, which may be light yellow or green to dark green, straw-brown, and black, has two dark spots on either side of the abdomen.
All development usually occurs on the underside of the leaf.
High populations of spider mites can develop quickly during hot, dry conditions. Webbing is usually visible during moderate to heavy infestations. The webbing can cover foliage and flowers, and detract from a plant's appearance. Heavy populations can severely defoliate and kill plants. Mites penetrate leaf surfaces with their sharp, slender mouthparts and remove cell contents.