Penetration of Permethrin and Knockdown in Larvae of Pyrethroid-Resistant and -Susceptible Strains of the Southern House Mosquito

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Larvae of Culex quinquefasciatus Say, susceptible or resistant to (+)-trans-permethrin (resistance ratio (RR) = 4143) and (+)-cis-permethrin (RR = 452), were examined for knockdown and rate of penetration of 14C-labeled permethrin. Susceptible larvae were knocked down within 10–20 min by dosages of 0.01 ppm or higher. Resistant larvae were unaffected by 1 ppm within 24 h and only partly by 10 ppm. Penetration was faster in the resistant than in the susceptible strains. However, significant differences did not occur until after the susceptible larvae became moribund. The higher penetration rate in the resistant strains was attributed to their continued activity throughout the exposure period. It was concluded that penetration was not a factor in resistance to permethrin in the strains studied.

Document Type: Research Article

Publication date: February 1, 1980

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