The establishment and spread of <i>Euphorbia graminea</i> Jacq. in sugarcane fields of Miyako islands Okinawa prefecture, Japan

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  • Nikawadori Yuki
    Okinawa Prefectural Agricultural Research Center Okinawa Prefectural Agricultural Research Center, Miyakojima Branch
  • Haraguchi Dai
    Okinawa Prefectural Agricultural Research Center, Miyakojima Branch Okinawa Prefectural Plant Protection Center
  • Nakasone Hiroaki
    Okinawa Prefectural Agricultural Research Center, Miyakojima Branch Okinawa Prefectural Hokubu Agriculture, Forestry and Fisheries Promotion Center
  • Gima Yasushi
    Okinawa Prefectural Agricultural Research Center, Miyakojima Branch
  • Taira Shuhei
    Okinawa Prefectural Agricultural Research Center, Miyakojima Branch
  • Sunakawa Yoshinobu
    Okinawa Prefectural Agricultural Research Center, Miyakojima Branch
  • Hiyane Shinichi
    Okinawa Prefectural Agricultural Research Center Okinawa Prefectural Agricultural Research Center Nago Branch
  • Kurosawa Takahide
    Faculty of Symbiotic Systems Science, Fukushima University
  • Asai Motoaki
    Institute for Plant Protection, NARO

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  • 沖縄県宮古島地域のサトウキビ圃場における外来雑草カワリバトウダイ（<i>Euphorbia graminea</i> Jacq.）の侵入・定着状況
  • 沖縄県宮古島地域のサトウキビ圃場における外来雑草カワリバトウダイ(Euphorbia graminea Jacq.)の侵入・定着状況
  • オキナワケン ミヤコジマ チイキ ノ サトウキビ ホジョウ ニ オケル ガイライ ザッソウ カワリバトウダイ(Euphorbia graminea Jacq.)ノ シンニュウ ・ テイチャク ジョウキョウ

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<p>Euphorbia graminea Jacq. (Euphorbiaceae), which is native to Mexico, was first recorded at Okinawa-honto Island, Japan in 2004. The authors recognized E. graminea growing in a wide range of Miyako-jima Island and invading sugarcane fields. To confirm the E. graminea distribution in the Miyako-jima region and to elucidate its expansion process, we conducted a herbarium survey, re-examination of earlier works related to weeds in sugarcane fields, and field surveys of 2017–2018 and 2019. The first record of the species in the Miyako-jima region was in 2007. Subsequently, within about five years, it expanded its distribution quickly and invaded sugarcane fields. Within about five years, it spread to almost all areas, except for a few islands. It was found in 20–30% of all the sugarcane fields in 2019. Our results suggest that E. graminea has become a major weed in sugarcane fields of the Miyako-jima region. Considering the rapid expansion of its distribution in the Miyako-jima area, it is expected to be necessary to monitor the alien species carefully in sugarcane fields of other regions of Okinawa Prefecture.</p>

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