Tetranychus urticae Koch, 1836, Koch, 1836

Toroitich, Faith J., Ueckermann, Edward A., Theron, Pieter D. & Knapp, Markus, 2009, The tetranychid mites (Acari: Tetranychidae) of Kenya and a redescription of the species Peltanobia erasmusi Meyer (Acari: Tetranychidae) based on males, Zootaxa 2176, pp. 33-47: 45-46

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http://doi.org/ 10.5281/zenodo.189364

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Tetranychus urticae Koch, 1836


Tetranychus urticae Koch, 1836  

Knob of male aedeagus always small, axis of knob parallel to shaft axis or forms a small angle with shaft axis; dorsal margin of knob and development of anterior and posterior projections may vary, but in most case they are similar (Figure E); male empodium I with strong medio-dorsal spur; about length of 2 proximoventral spurs; empodium II consists of 3 pairs of proximoventral hairs and a strong mediodorsal spur.

Specimens examined: From many hosts all over Kenya: Lycopersicon esculentum   ( Solanaceae   ), Phaseolus vulgaris   L. ( Fabaceae   ), Zea mays   L. ( Poaceae   ), Amaranthus hybridus   L. ( Amaranthaceae   )., Carica papaya   ( Caricaceae   ), Galinsoga parviflora   ( Asteraceae   )., Desmodium   sp. ( Fabaceae   ), Bidens pilosa   ( Asteraceae   ), Cucurbita pepo   ( Cucurbitaceae   ), Citrullus lanatus   ( Cucurbitaceae   ), Lactuca sativa   ( Asteraceae   ), Rosa   sp. ( Rosaceae   ), Passiflora edulis   ( Passifloraceae   ), Helianthus annuus   ( Asteraceae   ), Euphorbia   sp. ( Euphorbiaceae   ), Tradescantia fluminensis   ( Commelinaceae   ), Citrus   sp. ( Rutaceae   ), Brassica   sp. ( Brassicaceae   ), Lantana camara   ( Verbenaceae   ), Datura stramonium   ( Solanaceae   ), Pisum sativum   ( Fabaceae   ), Dianthus caryophyllus   ( Caryophyllaceae   ).

Remark: Tetranychus urticae   was first described on Glyine max   and Urtica   sp from Germany ( Koch, 1836). It is one of the most cosmopolitan spider mite species with worldwide distribution and a wide host range. It is considered a pest of many crops and is the most studied spider mite species with a high rate of pesticide resistance reported on this species by many authors. In Kenya, it is a major menace in cut flower production especially in Rosa   sp. Its first record in Kenya was on Allium ampeloprasum   ( Alliaceae   ) from Machakos district and on Lathyrus odorata   ( Fabaceae   ) from Nairobi ( Baker and Pritchard, 1960).