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1 March 2007 SYNERGISM BETWEEN CIS-PERMETHRIN AND BENZOYL PHENYL UREA INSECT GROWTH REGULATORS AGAINST AEDES AEGYPTI LARVAE
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Abstract

Emulsifiable concentrate formulations of 2 insect growth regulator (IGR) benzoyl ureas (novaluron and diflubenzuron) and the pyrethroid cis-permethrin were individually bioassayed against late 3rd- or early 4th-stage larvae of susceptible Aedes aegypti. The emergence inhibition 50% were 0.038, 0.048, and 0.179 ppb for novaluron, diflubenzuron, and cis-permethrin, respectively. We also tested 1:1 (v:v) mixtures of cis-permethrin and benzoyl ureas. Emergence inhibition 50% for novaluron plus cis-permethrin and diflubenzuron plus cis-permethrin were 0.030 and 0.037, respectively, with combination indexes of 0.49 and 0.56, indicating a synergistic interaction between these insecticides. The percentage of larval mortality produced by 0.5 ppb of the mixtures of cis-permethrin and each IGR was compared to the addition of larval mortality produced in separated experiments by 0.25 ppb of each component, after 5, 9 and 13 days of continuous exposure. In all bioassays, the novaluron plus cis-permethrin mixture produced a significantly higher larvicidal effect (P < 0.05) compared with the individual contribution of each compound. The diflubenzuron plus cis-permethrin mixture showed significantly higher larval mortality (P < 0.05) compared with the contributive effect of each insecticide after 9 and 13 days of exposure, but there was no significant difference after 5 days of exposure.

VALERIA SFARA, SUSANA A. DE LICASTRO, HECTOR M. MASUH, EMILIA A. SECCACINI, RAUL A. ALZOGARAY, and Eduardo N. Zerba "SYNERGISM BETWEEN CIS-PERMETHRIN AND BENZOYL PHENYL UREA INSECT GROWTH REGULATORS AGAINST AEDES AEGYPTI LARVAE," Journal of the American Mosquito Control Association 23(1), (1 March 2007). https://doi.org/10.2987/8756-971X(2007)23[24:SBCABP]2.0.CO;2
Published: 1 March 2007
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