TOXICITY OF SOME INSECTICIDES AGAINST A LABORATORY STRAIN AND THREE FIELD POPULATIONS OF MOSQUITO, Culex pipiens (L) | ||||
| Assiut Journal of Agricultural Sciences | ||||
| Article 12, Volume 40, Issue 1, March 2009, Page 159-168 PDF (394.75 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ajas.2009.268652 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Hosam Ezz El-Din | ||||
| Department of Plant Protection, Faculty of Agriculture, Assiut University, Assiut, Egypt | ||||
| Abstract | ||||
| Toxicity of malathion, profenophos, cypermethrin, fenvalerate, methomyl, propoxure, spinosad and abamectin was tested against larvae of laboratory (S) and three field (AM, AU and W) strains of C. pipiens (L). Based on LC50 values, spinosad was the most toxic compound against the S strain (LC50 = 0.0156 ppb), while fenvalerate and cypermethrin were the most effective insecticides against the three field populations. Values of LC50 for fenvalerate for AM, AU and W strains were 0.497, 0.315 and 0.868 ppb, respectively, and the corresponding values for cypermethrin were 0.898, 0.367 and 1.21 ppb. The carbamate insecticide, methomyl exhibited the least toxic effect against S, AM and Au strains; while the organophosphorus, malathion was the least toxic compound against W strain. Compar-ing LC50 values of the field strains with those of the laboratory strain (resistance ratio at LC50 level), spinosad showed the highest RR value in AM and AU strains (78.82 and 137.25, respectively). Malathion showed the highest RR value in W strain (1744.46). Slope and RR values revealed that all tested field populations were homogenous in their response toward all tested insecticides except for spinosad. The ability to build up resistance against insecticides from different groups was discussed. | ||||
| Keywords | ||||
| insecticides; laboratory strain; mosquito; field populations | ||||
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