scholarly journals Twospotted Spider Mite, Tetranychus urticae Koch (Arachnida: Acari: Tetranychidae)

EDIS ◽  
1969 ◽  
Vol 2003 (15) ◽  
Author(s):  
Thomas R. Fasulo ◽  
Harold A. Denmark
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Immature Stage ◽  
Cooperative Extension Service ◽  
The Body ◽  
Extension Service ◽  
Twospotted Spider Mite ◽  
University Of Florida ◽  
Tetranychus Urticae Koch ◽  
Twospotted Spider

The twospotted spider mite, Tetranychus urticae Koch, has been controversial in its taxonomic placement. About 60 synonyms included under this species have compounded the controversy. The body of a spider mite is separated into two distinct parts: (1) the gnathosoma and (2) the idiosoma. The gnathosoma includes only themouthparts. The idiosoma is the remainder of the body and parallels the head, thorax and abdomen of insects. After hatching from the egg, the first immature stage (larva) has three pair of legs. The following nymphal stages and the adult have four pairs of legs. This document is EENY-150 (originally published as DPI Entomology Circular 89), one of a series of Featured Creatures from the Entomology and Nematology Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Published: August 2000.  EENY150/IN307: Twospotted Spider Mite, Tetranychus urticae Koch (Arachnida: Acari: Tetranychidae) (ufl.edu)

Oviposition Response of Tetranychus urticae (Acari: Tetranychidae) to Direct Treatment and Residue of Pyrethroids on Soybean

1990 ◽  
Vol 25 (1) ◽  
pp. 158-169 ◽  
Author(s):  
D. J. Donahue ◽  
R. M. McPherson
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Leaf Surface ◽  
Oviposition Rate ◽  
Twospotted Spider Mite ◽  
Direct Treatment ◽  
Dosage Rate ◽  
Direct Exposure ◽  
Tetranychus Urticae Koch ◽  
Twospotted Spider

The oviposition response of the twospotted spider mite (TSSM), Tetranychus urticae Koch, to direct treatment and residues of fenvalerate and permethrin on soybean was examined in the laboratory. Contact with pyrethroid residues (120 ppm) reduced eggs per mite-day for 72 h, then oviposition rates returned to normal. Most eggs (99%) on the control leaflets were oviposited directly on the leaf surface, while 83% and 78% of the eggs in the fenvalerate and permethrin treatments were suspended off the leaf surface onto trichomes, cage walls or in the silk webbing. Oviposition rate on untreated soybean foliage following five days on pyrethroid residues was essentially the same for all TSSM; however, the mites previously exposed to fenvalerate or permethrin residue still oviposited 85% and 37% of their eggs off the untreated leaf surface, respectively. A 120 ppm concentration of fenvalerate directly applied to TSSM resulted in 83% and 100% mortality after 24 h and 48 h and no oviposition. A similar direct exposure to permethrin (120 ppm) resulted in 54% mortality after 48 h, and a 58.5% reduction in eggs per mite-day. Direct exposure to a lower dosage rate (12 ppm) caused little mortality but significantly reduced the number of eggs produced in both fenvalerate and permethrin treatments for 48 h. Oviposition returned to normal after 72 h.

Ultrastructure of the Alimentary Canal of the Twospotted Spider Mite, Tetranychus urticae Koch (Acarina:Tetranychidae)

2004 ◽  
Vol 10 (S02) ◽  
pp. 1558-1559
Author(s):  
A R Crooker
Keyword(s):  
Tetranychus Urticae ◽  
Alimentary Canal ◽  
Spider Mite ◽  
Twospotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
Twospotted Spider

Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.

Effect of Pesticide Interactions on the Twospotted Spider Mite on Peanuts1,2

1978 ◽  
Vol 5 (2) ◽  
pp. 83-86 ◽  
Author(s):  
W. V. Campbell
Keyword(s):  
North Carolina ◽  
Tetranychus Urticae ◽  
Spider Mite ◽  
Field Conditions ◽  
Severe Injury ◽  
Twospotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
Twospotted Spider

Abstract Pesticides commonly applied to the foliage of peanuts in North Carolina were evaluated under field conditions for their effect on the twospotted spider mite Tetranychus urticae Koch. Most fungicides caused a higher mite increase than insecticides on NC 2 peanuts. When fungicides and insecticides were tank mixed or applied on alternate weeks, mite outbreaks occurred. These outbreaks were followed by severe injury to the foliage and finally defoliation and yield reductions. Among the fungicides applied only Du-Ter and Copper Count failed to cause significant mite damage even when combined with an insecticide. Since mites failed to develop on untreated peanuts following six or more mite releases during the season, it was apparent that pesticides predispose peanuts to spider mite buildup and damage.

Twospotted Spider Mite, Tetranychus urticae Koch (Acari: Tetranychidae)

2008 ◽  
pp. 3997-4000
Author(s):  
James E. O’Hara ◽  
Igor UsUpensky ◽  
N. J. Bostanian ◽  
John L. Capinera ◽  
Reg Chapman ◽  
...  
Keyword(s):  
Tetranychus Urticae ◽  
Spider Mite ◽  
Twospotted Spider Mite ◽  
Tetranychus Urticae Koch ◽  
Twospotted Spider

scholarly journals Predatory Gall Midge (unofficial common name), Feltiella acarisuga (Vallot) (Insecta: Diptera: Cecidomyiidae)

EDIS ◽  
1969 ◽  
Vol 2004 (16) ◽  
Author(s):  
Ryan S. Osborne ◽  
Norman C. Leppla ◽  
Lance S. Osborne
Keyword(s):  
Spider Mite ◽  
Cropping Systems ◽  
Gall Midge ◽  
Spider Mites ◽  
Cooperative Extension Service ◽  
Twospotted Spider Mite ◽  
University Of Florida ◽  
Greenhouse Crops ◽  
Tetranychus Urticae Koch ◽  
Predatory Gall Midge

The predatory gall midge, Feltiella acarisuga (Vallot), is one of the most effective and widespread natural enemies of spider mites (Tetranychidae) (Gagne 1995). It is a particularly important natural enemy of the twospotted spider mite, Tetranychus urticae Koch, in a number of cropping systems (Opit et al. 1997). F. acarisuga could be particularly useful for integrated pest management of spider mites that attack greenhouse crops (Gillespie et al. 1998). This document is EENY-269, one of a series of Featured Creatures from the Entomology and Nematology Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Published: June 2002.  EENY269/IN549: Predatory Gall Midge (Unofficial Common Name), Feltiella acarisuga (Vallot) (Insecta: Diptera: Cecidomyiidae) (ufl.edu)

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