期刊
JOURNAL OF ECONOMIC ENTOMOLOGY
卷 106, 期 2, 页码 959-969出版社
OXFORD UNIV PRESS INC
DOI: 10.1603/EC12284
关键词
Aedes aegypti; pyrethroids; insecticide resistance; cross-resistance
类别
资金
- FOMIX CONACyT, Veracruz within the project Estrategia de control del mosquito vector del dengue Aedes aegypti (L.) en base a su resistencia a insecticidas en Veracruz [68298]
- CONACyt Ciencia Basica Grant within the project Mutacion 'kdr' asociada a la resistencia a piretroides en Aedes aegypti (L.) en Mexico [102120]
- UANL PAICYT
- NIH-NIAID [U01 AI088647]
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [U01AI088647] Funding Source: NIH RePORTER
Seven F-1 strains of Aedes aegypti (L.) were evaluated by bottle bioassay for resistance to the pyrethroids d-phenothrin, permethrin, deltamethrin, lambda-cyalothrin, bifenthrin, cypermethrin, alpha-cypermethrin, and z-cypermethrin. The New Orleans strain was used as a susceptible control. Mortality rates after a 1 h exposure and after a 24 h recovery period were determined. The resistance ratio between the 50% knockdown values (RRKC50) of the F-1 and New Orleans strains indicated high levels of knockdown resistance. The RRKC50 with alpha-cypermethrin varied from 10 to 100 among strains indicating high levels of knockdown resistance. Most of the strains had moderate resistance to d-phenothrin. Significant but much lower levels of resistance were detected for lambda-cyalothrin, permethrin, and cypermethrin. For z-cypermethrin and bifenthrin, only one strain exhibited resistance with RRKC50 values of 10- and 21-fold, respectively. None of the strains showed RRKC50 >10 with deltamethrin, and moderate resistance was seen in three strains, while the rest were susceptible. Mosquitoes from all strains exhibited some recovery from all pyrethroids except d-phenothrin. Regression analysis was used to analyze the relationship between RRLC50 and RRKC50. Both were highly correlated (R-2 = 0.84-0.97) so that the slope could be used to determine how much additional pyrethroid was needed to ensure lethality. Slopes ranged from 0.875 for d-phenothrin (RRLC50 similar or equal to RRKC50) to 8.67 for lambda-cyalothrin (similar to 8.5-fold more insecticide needed to kill). Both RRLC50 and RRKC50 values were highly correlated for all pyrethroids except bifenthrin indicating strong cross-resistance. Bifenthrin appears to be an alternative pyrethroid without strong cross-resistance that could be used as an alternative to the current widespread use of permethrin in Mexico.
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