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Spider mites are members of the family Tetranychidae, which includes about 1,200 species. [1] They are part of the subclass Acari (mites). Spider mites generally live on the undersides of leaves of plants , where they may spin protective silk webs , and can cause damage by puncturing the plant cells to feed. [ 2 ]
The mites are found in many areas worldwide and are major greenhouse pests. P. latus infestation can typically cause stunting and twisting of the leaves and flowers, blackening, and death of new growth. The damage resembles that caused by auxin herbicides, which are thought to be a result of toxins produced in their salivary glands. [2]
Tetranychus urticae (common names include red spider mite and two-spotted spider mite) is a species of plant-feeding mite generally considered to be a pest. It is the most widely known member of the family Tetranychidae or spider mites. Its genome was fully sequenced in 2011, and was the first genome sequence from any chelicerate.
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Bryobia is a genus of mites in the spider mite family, Tetranychidae. The taxonomy of the genus is difficult. The genus has been revised several times. It is difficult to distinguish these tiny species from each other on the basis of morphological characters, and there is little agreement on which characteristics are of importance.
Petrobia harti attacks various weeds (especially Oxalis spp.) and also fruit and ornamental plants. It has been dispersed to most of the world. Petrobia latens attacks various fruit, vegetable and grain crops. It is one of the few spider mites proven to transmit barley yellow streak mosaic virus.
Oligonychus milleri (pine spider mite), [5] known from many species of pine [11] Oligonychus oryzae (paddy leaf mite, rice leaf mite), a pest of rice [12] Oligonychus palus, banana [13] Oligonychus perditus, a pest of ornamental conifers, such as juniper bonsai [14] Oligonychus perseae (persea mite), a top pest of avocado in California, also on ...
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]