Studies on Synthetic Pyrethroids 17-Toxicity, Joint Toxic Effect and Synergism of Synthetic Pyrethroids Against the Egyptian Cotton Leafworm, Spodoptera Littoralis | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 3, Issue 1, June 1991, Pages 34-49 PDF (760.04 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.1991.461550 | ||
| Authors | ||
| Abd El-Salam Marei* 1; Medy Youssef2; Magdy Shekeban2; Mahmoud Zeid1 | ||
| 1Pesticide Division, Faculty of Agriculture, University of Alexandria | ||
| 2Agriculture Research Center. Pesticide Central Lab. Sabbahia, Alexandria | ||
| Abstract | ||
| The toxicity, joint toxic effect, and Synergism of different pyrethroid pairs against the Egyptian cotton Leafworm, Spodoptera Littoralis, were studied. The dihalopyrethroid, deltamethrin and tetrahalopyrethroid tralomethrin showed the same toxicity. The cyanopyrethroid, cypermethrin, was more toxic than the noncyano pyrethroid permethrin by 11.6fold; the toxicity index was 44 and 3.8, respectively. The cis isomer of permethrin or cypermethrin gave higher toxicity than the corresponding trans isomer. LD50 values of cis permethrin, trans permethrin, cis cypermethrin and trans cypermethrin were 0.023, 0.034, 0.0025, and 0.0076 µg/ larvae, respectively. Fenvalerate representing the p-chlorophenyl pyrethroid derivative, was higher as toxic as flucythrinate which represent the p-difluoromethoxy pyrethroids by 2.1 folds. The toxicity index was 60 and 28.9, respectively. Mixing profenofos or prcpoxur insecticide with the tested pyrethroids as esterase inhibitors resulted in an increase in the toxicity of the pyrethroids by 9 1.4- 12.9 or 1.1- 5.0 fold, respectively. Fipronyl butoxide synergized the tested pyrethroids by 1.3-15.2-fold. | ||
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