Journal
PEST MANAGEMENT SCIENCE
Volume 66, Issue 7, Pages 705-708Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.1931
Keywords
Triatoma infestans; resistance; pyrethroid; deltamethrin; inheritance
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Funding
- UNICEF/UNDP/World Bank/World Health Organization
- Consejo Nacional de Investigaciones Cientificas y Tecnicas of Argentina
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BACKGROUND: Triatoma infestans (Klug) is the major Chagas disease vector in the Southern Cone area of South America, and its chemical control is based on the use of pyrethroid insecticides. Resistance to deltamethrin in Salta Province, Argentina, has been detected in field populations since 2002, causing the failure of vector control campaigns in this disease-endemic area. The inheritance of deltamethrin resistance in T. infestans was evaluated through reciprocal crosses conducted between resistant and susceptible insects. RESULTS: The response of the reciprocally mated insects' progeny to deltamethrin was intermediate between the highly resistant and the susceptible parent colonies. Lack of significant differences between the LD(50) and resistance ratios of the reciprocally mated insects indicated no sex linkage on this trait. CONCLUSION: Bioassay results, in addition to degree of dominance calculations, suggest that the resistance to deltamethrin in T. infestans is controlled by semi-dominant, autosomally inherited factors. (C) 2010 Society of Chemical Industry
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