Online databases are becoming a standard tool to study taxonomy, biodiversity, and ecology. We have developed a comprehensive database for the family Tetranychidae (spider mites). The Tetranychidae is one of the most important families of the Acari in terms of economic impact, because it comprises several agricultural pest species of major relevance, such as the cosmopolitan Tetranychus urticae. The aim of the web site is to gather information on all described spider mites in the world. The main goal is to provide a synthetic view of the biodiversity of this mite family. 1,280 literature references are included, from 1758 to present. 1,257 species, more than 11,745 host plants, and 5,380 geographical data are recorded in 17 tables. The database includes taxonomic data relating the history of nomenclature, geographical distribution, and host plants for all species examined. Three types of query are available to retrieve this information: (1) 'By Species' allows to search on species names and synonyms; (2) 'Advanced' performs a cross search including taxonomical, geographical, and host-plant information; and (3) 'Bibliography' allows searching references combining one, two, or three authors, and it displays all nomenclatural, host plant, and geographical data for the selected reference.

Spider Mites Web: A comprehensive database for the Tetranychidae

The literature pertaining to the bionomics of some of the most important tetranychids
 is reviewed. Considerable attention is paid to the possibilities of spider mites reaching
 pest levels as a result of environmental factors. It is concluded that more information
 is needed on economic injury levels of various species on different crops and under
 various climatic conditions. The influences of cultural practices and their interactions
 as related to population development of tetranychids also need more study. Furthermore,
 work is needed on the influence of climatic conditions on development of tetranychid
 mite populations together with possible predictability of outbreak situations. Finally,
 we need to know more about the fundamental relations between the host-plant quality
 and spider mite development, and the impact of spider mites on the development of
 their host plants.

Ecology of tetranychid mites and their natural enemies: a review iii. biology, ecology and pest status, and host plant relations of tetranychids

Biological Aspects of Some Phytophagous Mites

Seventy-one species of plant-feeding mites of the superfamily Tetranychoidea are known
 to occur in Africa and Mauritius. Keys are provided for their identification, and
 records of their occurrence in this part of the world are presented.
 The following new species are described.
 Tetranychidae:
 Petrobia moutiai, Eutetranychus cratis, E. bredini, E. clastus, E. enodes, E. apheles,
 Eotetranychus cactorum, E. ancora, E. cernuus, E. cyphus, E. cyphus, Schizotetranychus
 reticulatus, S. spiculus, S. sacrales, S. gausus, S. rhodanus, Oligonychus licinus,
 O. calcls, O. simus, O. tylus, O. saccharinus, O. grypus, O. plegas, Tetranychus tumidosus,
 T. andrei, T. macfarlanei, T. evansi, T. sayedi, T. browningi, T. lombardinii.
 Tenuipalpidae:
 Tenuipalpus attiahi, T. lawrencei.

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The tetranychoid mites of Africa

Revision of the Spider Mite Family Tetranychidae of Japan (Acari, Prostigmata)

Mites of the family Tetranychidae.

The Red Spider on Cotton

The red spiders of America and a few European species likely to be introduced

Descriptions of seven new species of red spiders

"By the adoption of the preventive measures described in this bulletin it is possible to avoid the losses caused by the so-called red spider, a minute creature which injured 20,000 acres of cotton in South Carolina in 1912, and is similarly destructive in other Southern States. Injury by the red spider in cotton fields may occur from the middle of June until the middle of September. It consists in a rusting and dropping of the leaves and sometimes in the death of the affected plants over considerable portions of the fields. For many years this trouble has been called "rust" by cotton planters, who concluded from the reddening of the leaves that it was a disease. The injury, however, is caused by the presence on the cotton leaves of multitudes of small mites called red spiders." -- title page

E. A. McGregor

Papers

Mites of the family Tetranychidae.

The Red Spider on Cotton

The red spiders of America and a few European species likely to be introduced

Descriptions of seven new species of red spiders

The Red Spider on Cotton and How to Control It