Mating Competitiveness of Culex tarsalis1 Double Translocation Heterozygote Males in Laboratory and Field Cage Trials3

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Abstract
Culex tarsalis males, heterozygous for a double translocation designated T(l;2;3)1A were tested for their potential use as a genetic control mechanism. Small cage experiments demonstrated that translocated males mated with females of 3 different strains while in the competitive presence of normal males. The mating competitiveness of translocated males seemed to be at least at the 1.0 or higher level. In large outdoor cages T(1;2;3)1A and laboratorystrain males in a 1:1 ratio competed for mating with colony-derived females. Hatch rate was reduced by 34% compared to the normal control in the 1st generation. The mating competitiveness of translocated males was estimated to be at a 0.73 level. A continued suppression in hatch rate due to the translocation was demonstrated in the subsequent generation. In a 2nd outdoor experiment, T(l;2;3)1A males were tested against field-collected males for field-collected females and egg hatch was reduced by 20%. The mating competitiveness of the translocated males was estimated to be at a 0.75 level.

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