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; Cambridge University Press; Volume: 97; Issue: 2 Linguagem: Inglês
10.4039/ent97172-2
ISSN1918-3240
Autores Tópico(s)Insect Pest Control Strategies
ResumoAbstract The 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 LD 50 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 LD 95 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.
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