Effects on Insecticidal Selection and Treatment on Reproductive Potential of Resistant, Susceptible, and Heterozygous Strains of the Southern House Mosquito

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Abstract:

The effects of the organophosphate insecticide temephos on the reproductive potential of Culex quinquefasciatus Say was investigated on a resistant (RR) strain, a susceptible (SS) strain, and a heterozygous (RS) strain synthesized from them. Strains were treated as larvae at two to four mortality levels, and daily fertility and fecundity estimates were made on a sample of the adult survivors. From these data, the intrinsic rate of increase, r, was calculated. This measure was found to be a more useful estimate of reproductive potential than fecundity or fertility alone.

The RR strain that had been maintained under strong selection pressure before the study exhibited several classical effects of strong directional selection; it was less fecund, took longer to develop, and had poorer viability than a similar strain that had been maintained without selection. In addition, the reproductive potential of this strain was adversely affected at all three treatment levels investigated. The SS strain also was affected adversely by treatment, but the RS strain showed no apparent biotic effect.

Document Type: Research Article

Publication date: June 1, 1981

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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