Inhibitory substances contained in calcium carbonate wettable powder on the oviposition of the peach fruit moth, Carposina sasakii

  • Kazama Haruna
    Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University
  • Oohata Yuuto
    Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University
  • Takanashi Takuma
    Department of Forest Entomology, Forest Research and Management Organization
  • Tokoro Masahiko
    Department of Forest Entomology, Forest Research and Management Organization
  • Ishiguri Yoichi
    Apple Research Institute, Aomori Prefectural Industrial Technology Research Center
  • Mori Naoki
    Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University
  • Yoshinaga Naoko
    Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University

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  • Inhibitory substances contained in calcium carbonate wettable powder on the oviposition of the peach fruit moth, <i>Carposina sasakii</i>

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<p>Spraying a calcium carbonate suspension “White Coat” on the fruit of apples significantly suppresses the oviposition of the peach fruit moth, Carposina sasakii. In gas chromatography (GC) with an electroantennographic detector analysis, adult female antennae showed responses to three compounds that were identified as 2,2,4-trimethyl-1,3-pentanediol diisobutyrate (TXIB) and its two mono-hydrolyzed analogs, texanols (1- and 3-isobutyrates), all added as a plasticizer to the agents. An oviposition-choice test using adult moths revealed that TXIB has clear deterrent properties when applied to young apple fruits. Video recording analysis showed that female moths spent longer on self-grooming and searching around TXIB-treated fruits. In the same assay, pure calcium carbonate treatment prevented the moths from climbing up or landing on the fruits, while such was not the case with White Coat-treated fruits. TXIB, an adjuvant aimed to provide rain/wind resistance, weakened the slipperiness of the calcium carbonate coating but, coincidentally, maintained the oviposition inhibitory activity of the White Coat by its deterrent odorant.</p>

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