Joint Action of Chlorfluazuron with Synergists and Insecticides in Chlorfluazuron-Susceptible and Resistant Strains of Diamondback Moth, <i>Plutella xylostella</i>

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  • FAHMY Adel Ramzy
    Laboratory of Applied Entomology, School of Agricultural Sciences, Nagoya University Department of Entomology, Faculty of Science, Ain Shams University
  • MIYATA Tadashi
    Laboratory of Applied Entomology, School of Agricultural Sciences, Nagoya University

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Other Title
  • クロルフルアズロン感受性および抵抗性コナガにおけるクロルフルアズロンと共力剤および殺虫剤との共力作用ならびに連合作用
  • Joint Action of Chlorfluazuron with Synergists and Insecticides in Chlorfluazuron-Susceptible and Resistant Strains of Diamondback Moth,Plutella xylostella
  • Joint Action of Chlorfluazuron with Synergists and Insecticides

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The synergistic action of triphenyl phosphate (TPP) and piperonyl butoxicide (PB) on chlorfluazuron was studied in chlorfluazuron-susceptible and resistant larvae of diamondback moth, Plutella xylostella (L.). Synergistic ratios with TPP and PB were approximately 7 and 4, respectively, in two resistant strains, namely TL-resistant (TL-R) and BK-resistant (BK-R) strains. There was no synergism with TPP and PB in TL-susceptible (TL-S) strain, while there was up to 2-fold with TPP and 3-fold with PB in the BK-susceptible (BK-S) strain. From these results, it is likely that the enhanced degradation of chlorfluazuron by a TPP-sensitive enzyme system is responsible for chlorfluazuron resistance in diamondback moth. Teflubenzuron at a nontoxic level (<LC1) synergized chlorfluazuron in the resistant strains but did not in the susceptible strains. This result suggests that teflubenzuron interferes with chlorfluazuron degradation enzyme. Binary mixtures of chlorfluazuron with either teflubenzuron or pyriproxyfen produced a clear potentiation, especially in the resistant strains. On the other hand, there was no detectable joint action with fenvalerate, phenthoate, or thiodicarb. Potentiation of chlorfluazuron by teflubenzuron and pyriproxyfen might be due to interference at the site of action and/or with the chlorfluazuron degradation enzyme by teflubenzuron and pyriproxyfen.

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