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The development of repellents as alternatives to insecticides has expanded in recent years. However, their use in isopod pest control is limited. To develop an isopod repellent, a plant extract library from wild plants native to the Kochi Prefecture was screened for repellent activity against pillbugs, and 82 samples (87%) exhibited repellent activity. Among them, (E)-7-phenyl-2-heptene-4,6-diyn-1-ol was isolated and identified as a repellent from the root of Bidens pilosa. It had a half-maximal effective concentration of 0.20 µm, with a strong repellency. A study of the structure-activity relationship to (E)-7-phenyl-2-heptene-4,6-diyn-1-ol revealed that the presence of a hydroxyl group and an aromatic at both ends of the length of the seven-carbon chain is important for the expression of repellency. These results can potentially lead to a new repellent of phenylalkyl alcohol. © The Author(s) 2023. Published by Oxford University Press on behalf of Japan Society for Bioscience, Biotechnology, and Agrochemistry.

Citation

Masashi Ishida, Yuika Yamaji, Wakana Isoda, Haruki Abe, Masashi Sato, Keisuke Kariya, Atsushi Ishihara, Shin-Ichi Tebayashi, Shu-Ushi Sato. E)-7-phenyl-2-heptene-4,6-diyn-1-ol from Bidens pilosa as a repellent against isopods. Bioscience, biotechnology, and biochemistry. 2023 Jul 24;87(8):833-838

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PMID: 37169915

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