Factors influencing the toxicity of xenobiotics against larval mosquitoes.
In order to examine the factors influencing xenobiotic toxicity against larval mosquitoes, the larvicidal performances of two conventional insecticides (temephos and Bacillus thuringiensis var. israelensis: Bti) and a new potential phyto-insecticide (decomposed leaf litter) were compared under different conditions against three detritivorous larval mosquito types. Bioassays performed under standard conditions indicated differential tolerance levels according to the xenobiotic and the larval type. Bioassays performed under different conditions of xenobiotic dose and geometry of the water column indicated differential effects of those parameters on mortality rates. This allowed us to distinguish the performances of temephos versus those of Bti and leaf litter. These toxicological performances were examined as indicators for analysis of xenobiotic bioavailability for mosquito larvae in environmental water, and also for their comparative interest in field mosquito control.
Rey
Delphine
D
Laboratoire d'écologie alpine, UMR 5553, université Joseph-Fourier, BP 53, 38041 Grenoble, France.
David
Jean-Philippe
JP
Meyran
Jean-Claude
JC
D000330:Aedes / Q000254:growth & development; D029661:Alnus; D000818:Animals; D000852:Anopheles / Q000254:growth & development; D001413:Bacillus thuringiensis; D003465:Culex / Q000254:growth & development; D009033:Culicidae; D007306:Insecticides / Q000008:administration & dosage*; D007814:Larva; D018515:Plant Leaves; D000002:Temefos / Q000008:administration & dosage; D015262:Xenobiotics / Q000008:administration & dosage*
D007306:Insecticides; D015262:Xenobiotics; D000002:Temefos