Toxicity and the latent effect of certain pyrethroids on pink bollworm | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 18, Issue 1, 2010, Pages 23-36 | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2010.459103 | ||
| Authors | ||
| Magdy M. K. Shekeban* ; Ibrahim H. El-Nemky | ||
| Plant Protection Research Institute, Agriculture Research Center, Egypt. | ||
| Abstract | ||
| Vail residue assay technique was used in laboratory trails to study the toxicity of certain pyrethroids (deltamethrin, cypermethrin, cyfluthrin, α-cypermethrin and fenpropathrin) against both males and females of the laboratory population of pink bollworm. Regarding the toxicity results against the male moths, deltamethrin was the most toxic followed by cyfluthrin, α- cypermethrin, cypermethrin and the lowest toxic insecticide was fenpropathrin. Also against the female moths deltamethrin proved to be the most toxic followed by cyfluthrin, fenpropathrin, α- cypermethrin where cypermethrin was the least toxic one. The toxicity data mean that female moth is tolerant than male moth. The survival males and females were transferred to the matting cages (one pair / cage) to study the latent effects of these pyrethroids. The fecundity study indicated that there was a significant difference between treated and untreated females; this difference is a response to the treatment with pyrethroids. The most effective insecticide on the fecundity of females was α-cypermethrin followed by deltamethrin, cyfluthrin, cypermethrin and the least effective one was fenpropathrin. The viability of the laid eggs showed high reduction percentages of the hatched eggs. General observations indicated that all the treatments produced few viable eggs, the greatest effect was for cypermethrin and cyfluthrin followed by deltamethrin, α-cypermethrin and then fenpropathrin. Regarding the larval stage it was obvious that cyfluthrin showed superiority over the other used insecticides, while the least effective one was deltamethrin. On the other hand, not all the developed offspring succeed to be pupae there were some of them malformed and dead in all the treatments and the untreated except the treatment of cypermethrin. The effect on the pupal stage revealed that both deltamethrin and cyfluthrin hadn't reduced the developed pupae to adults, while the rest treatments gave slight reduction. | ||
| Keywords | ||
| Pyrethroids; toxicity; Pink bollworm; latent effect; fecundity; viability | ||
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