Relative Toxicity of Permethrin to Mononychellus progresivus Doreste and Tetranychus urticae Koch (Acari: Tetranychidae) and Their Predators Amblyseius limonicus Garman & McGregor (Acari: Phytoseiidae) and Oligota minuta Cameron (Coleoptera: Staphylinidae): Bioassays and Field Validation

1987 ◽  
Vol 16 (2) ◽  
pp. 545-550 ◽  
Author(s):  
A. R. Braun ◽  
J. M. Guerrero ◽  
A. C. Bellotti ◽  
L. T. Wilson
Keyword(s):  
Tetranychus Urticae ◽  
Relative Toxicity ◽  
Field Validation ◽  
Mononychellus Progresivus ◽  
Tetranychus Urticae Koch

Relative Toxicity of Parathion and Kelthane to the Predacious Mite Phytoseiulus persimilis Athias-Henriot and its Prey, Tetranychus urticae Koch, (Acarina: Phytoseiidae, Tetranychidae) in the Laboratory

1965 ◽  
Vol 97 (2) ◽  
pp. 172-176 ◽  
Author(s):  
D. C. Herne ◽  
D. A. Chant
Keyword(s):  
Tetranychus Urticae ◽  
Phytoseiulus Persimilis ◽  
Test Method ◽  
Similar Relationship ◽  
Relative Toxicity ◽  
Predacious Mite ◽  
Spray Tower ◽  
Tetranychus Urticae Koch

AbstractThe relative toxicity of Kelthane (1,1-bis (p-chlorophenyl) -2,2,2-trichloroethanol), and parathion to Phytoseiulus persimilis Athias-Henriot and its prey, Tetranychus urticae K. (= telarius (L.)), was determined using a Potter Spray Tower. Parathion was found to be far more toxic to P. persimilis than was Kelthane. The LD50 values for Kelthane were 0.051% and 0.29% for T. urticae and P. persimilis respectively, and for parathion were 0.050% and 0.0044% respectively. The LD95 values bore a similar relationship to each other. The two materials were equally toxic to T. urticae. Therefore, use of Kelthane rather than parathion in an environment where P. persimilis and T. urticae were interacting would favour the beneficial species. The statistical aspects of the test method are discussed.

Toxicity of Spirodiclofen to the Predatory Mite, Amblyseius womersleyi (Acari: Phytoseiidae), and its Prey, Tetranychus urticae (Acari: Tetranychidae)

2007 ◽  
Vol 42 (1) ◽  
pp. 44-51 ◽  
Author(s):  
Geum Su Cheon ◽  
Chae Hoon Paik ◽  
Geon Hwi Lee ◽  
Sang Soo Kim
Keyword(s):  
Tetranychus Urticae ◽  
Adult Female ◽  
Integrated Management ◽  
Predatory Mite ◽  
Relative Toxicity ◽  
Amblyseius Womersleyi ◽  
High Concentrations ◽  
Tetranychus Urticae Koch ◽  
Sublethal Concentrations ◽  
Laboratory Bioassays

The relative toxicity of spirodiclofen to the predatory mite, Amblyseius womersleyi Schicha (Acari: Phytoseiidae), and its prey, Tetranychus urticae Koch (Acari: Tetranychidae), was evaluated in laboratory bioassays. Spirodiclofen was much less toxic to A. womersleyi than to T. urticae. Although the survival rate of adult females of A. womersleyi tended to decrease with increasing concentrations of spirodiclofen, 62–96% of the predators survived at concentrations of 22.5–180 ppm. Reproduction of adult female predators was only significantly affected at high concentrations (90 and 180 ppm). Spirodiclofen did not affect the hatch of A. womersleyi eggs at any concentration tested. Survival of immature predators was significantly decreased with increasing spirodiclofen concentration, however, 30–78% of immature predators reached adulthood at 22.5–45 ppm. Adult female predators survived on a diet of spider mites treated with spirodiclofen, and their fecundity was not significantly affected. Moreover, immature predators developed normally on prey treated with spirodiclofen. Spirodiclofen at selective sublethal concentrations (i.e., 22.5–45 ppm) could be of value in adjusting the prey/predator ratio in integrated management of T. urticae.

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