Benzoylurea resistance in western flower thrips <i>Frankliniella occidentalis</i> (Thysanoptera: Thripidae): the presence of a point mutation in <i>chitin synthase 1</i>

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  • Suzuki Youhei
    Graduate School of Bio-Agricultural Sciences, Nagoya University
  • Shiotsuki Takahiro
    National Agriculture and Food Research Organization Faculty of Life and Environmental Science, Shimane University
  • Jouraku Akiya
    National Agriculture and Food Research Organization
  • Miura Ken
    Graduate School of Bio-Agricultural Sciences, Nagoya University
  • Minakuchi Chieka
    Graduate School of Bio-Agricultural Sciences, Nagoya University

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  • ベンゾイルウレア系殺虫剤抵抗性のミカンキイロアザミウマにおけるキチン合成酵素遺伝子<i>chitin synthase 1</i>の点突然変異
  • Benzoylurea resistance in western flower thrips Frankliniella occidentalis (Thysanoptera: Thripidae) : the presence of a point mutation in chitin synthase 1

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Abstract

<p>We examined the susceptibility of field strains (BO-1, BO-2, TO-1, and YH-1) and one laboratory strain (H-1) of the western flower thrip, Frankliniella occidentalis, to benzoylureas. LC50 values of novaluron were determined as 0.64 ppm against laboratory strain and 2.1–130 ppm against field strains. In the presence of piperonyl butoxide, a cytochrome P450 inhibitor, the insecticidal activity of novaluron tended to be enhanced. To examine whether point mutations in chitin synthase 1 (CHS1) discovered in an etoxazole-resistant strain of Tetranychus urticae and a benzoylurea-resistant strain of Plutella xylostella exist in F. occidentalis, the nucleotide sequence of CHS1 was analyzed. We found a nonsynonymous substitution that corresponded to the location of the mutations found in T. urticae and P. xylostella in the field strains of F. occidentalis but not in the laboratory strain, indicating that this point mutation might be associated with the benzoylurea resistance exhibited by the field strains.</p>

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