Authors: Eritja, Roger; Chevillon, Christine

Source: Journal of Medical Entomology, Volume 36, Number 1, January 1999 , pp. 41-49(9)

Publisher: Entomological Society of America

Abstract:

Within the Llobregat Delta (Barcelona, Spain), Culex pipiens L. has been the target of organophosphate insecticide (OP) control for 10 yr (1982-1992). Between 1991 and 1992, OPs were replaced by Bacillus-based toxins in all the mosquito control programs within >150 km of this area. The distribution of several OP-resistance genes was surveyed within the Llobregat Delta and neighboring populations (<25 km) during the 2 yr following this regional pesticide change to investigate how the change in selection pressure affected the dynamics of OP-resistance genes. The immigration failure of the A2-B2 resistant esterases and the observed difference in OP-resistance dynamics between isolated and nonisolated populations may indicate fitness disadvantages associated with OP-resistance genes, hence a tendency for a decrease in OP-resistance. In contrast, one OP-resistance gene further increased in frequency, whereas the frequencies of some others were maintained. These unexpected results question the importance of pesticides from sources other than mosquito control, and the variability of pleiotropic fitness costs among pesticide resistance genes.

Keywords: Culex pipiens; pesticide management; resistance cost; esterases; acetylcholinesterase

Document Type: Research article

Publication date: 1999-01-01

More about this publication?

• Journal of Medical Entomology is published bimonthly in January, March, May, July, September, and November. The journal publishes reports on all phases of medical entomology and medical acarology, including the systematics and biology of insects, acarines, and other arthropods of public health and veterinary significance.
  
  The journal is divided into the following sections: Morphology, Systematics, Evolution; Sampling, Distribution, Dispersal; Development, Life History; Population and Community Ecology; Behavior, Chemical Ecology; Population Biology/Genetics; Molecular Biology/Genomics; Neurobiology, Physiology, Biochemistry; Vector Control, Pest Management, Resistance, Repellents; Arthropod/Host Interaction, Immunity; Vector/Pathogen/Host Interaction, Transmission; Vector-Borne Diseases, Surveillance, Prevention; Direct Injury, Myiasis, Forensics; Modeling/GIS, Risk Assessment, Economic Impact. In addition to full-length research articles, the journal publishes interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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