Type of inheritance in mosquito larvae, Culex pipiens resistant to malathion, fenitrothion and tetramethrin insecticides | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 3, Issue 1, June 1991, Pages 63-76 PDF (1.45 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.1991.461552 | ||
| Authors | ||
| Fathia I. Moustafa* ; A. A. Mahran; Nabila S. Ahmed; M. A. Mourad | ||
| Faculty of Agriculture, Alexandria University | ||
| Abstract | ||
| Crosses between malathion, fenitrothion, or tetramethrin-resistant strains and susceptible strain were done. There were no differences between the two hybrids, whether males or females were resistant. It means no sex linked inheritance of resistance to malathion, fenitrothion, and tetramethrin. Results of first generation hybrid revealed that inheritance of the insecticide resistance in C. pipiens is due to partially dominant gene(s). Also, the character is autosomal, or each parent could induce resistance to the hybrid. Concerning the second generation of the malathion and fenitrothion resistant strains, there was a deflection in the complete LDP line around 25% kill thus it confirms the responsibility of the monofactorial inheritance. While in tetramethrin resistant strains the observed dose response curve of the progeny of the second generation differs significantly from the curve which might be expected on the basis of monofactorial inheritance. Also, deflection of the line at about LC50 was not observed. Thus, it is concluded that tetramethrin-resistant in C. Pipiens may be due to more than one gene. The linearity of second-generation curve indicates that this resistance is polyfactorial Observed and expected mortality for back-cross were plotted. The deflection in these lines at about 50% kill indicate the segregation of groups of phenotypes at 1:1 ratio (RS:SS). Thus, result confirm the possibility of monogene inheritance to malathion and fenitrothion. Analysis of the observed and expected responses on the bases of monogene inheritance yielded X2 values less than that of tabulated. This is another confirmation that Inheritance of resistance to malathion and fenitrothion in C. pipiens is monofactorial. But in tetramethrin- resistant strains, the observed dose response curve of the progeny of the back-cross differs. significantly from the expected curve which might be explained on the basis of monofactorial inheritance. The linearity of the observed backcross curve indicates that this resistance is polyfactorial. Thus, it is concluded that tetramethrin resistance in C. pipiens may be due to more than one gene. | ||
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