scholarly journals Surface and Ultrastructural Feeding Injury to Strawberry Leaves by the Twospotted Spider Mite

HortScience ◽  
1990 ◽  
Vol 25 (8) ◽  
pp. 948-951 ◽  
Author(s):  
Richard J. Campbell ◽  
Randolph L. Grayson ◽  
Richard P. Marini
Keyword(s):  
Spider Mite ◽  
Leaf Surface ◽  
Twospotted Spider Mite ◽  
Fragaria Ananassa ◽  
Lower Leaf Surface ◽  
Palisade Parenchyma ◽  
Mesophyll Cells ◽  
Transmission Electron ◽  
Vascular Elements ◽  
Twospotted Spider

Scanning and transmission electron microscopy were used to investigate damage to strawberry (Fragaria ×ananassa Duch.) leaves caused by twospotted spider mite (Tetranychus urticae Koch.). Mites damaged epidermal cells on the lower leaf surface, but did not damage major vascular elements of the leaf. Mite-damaged spongy and palisade parenchyma cells had coagulated protoplasts, with some cells devoid of cellular contents. Mesophyll cells adjacent to damaged regions showed no ultrastructural distortion or disruption of chloroplasts.

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.

Genetic Transfer of a Twospotted Spider Mite (Acari: Tetranychidae) Repellent in Tomato Hybrids

2005 ◽  
Vol 98 (5) ◽  
pp. 1710-1716 ◽  
Author(s):  
John C. Snyder ◽  
Richard R. Thacker ◽  
Xuemei Zhang
Keyword(s):  
Spider Mite ◽  
Twospotted Spider Mite ◽  
Genetic Transfer ◽  
Twospotted Spider

scholarly journals TWOSPOTTED SPIDER MITE CONTROL WITH MITICIDES, 2004

2005 ◽  
Vol 30 (1) ◽  
Author(s):  
Kenneth A. Sorensen ◽  
Dennis G. Cooke
Keyword(s):  
Spider Mite ◽  
Twospotted Spider Mite ◽  
Mite Control ◽  
Twospotted Spider

Effects of Neonicotinoid Insecticides on the Bionomics of Twospotted Spider Mite (Acari: Tetranychidae)

2004 ◽  
Vol 97 (5) ◽  
pp. 1587-1594 ◽  
Author(s):  
Mouhoube Ako ◽  
Christian Borgemeister ◽  
Hans-Michael Poehling ◽  
Alfred Elbert ◽  
Ralf Nauen
Keyword(s):  
Spider Mite ◽  
Twospotted Spider Mite ◽  
Neonicotinoid Insecticides ◽  
Twospotted Spider
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