Weeding system of field margins to prevent invasion upon soybean fields and seed dispersal of <i>Ipomoea hederacea</i> Jacq. var. <i>integriuscula</i> A.Gray in northern Kanto

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  • Ihara Nozomi
    Institute for Plant Protection, NARO Center for Weed and Wildlife Management, Utsunomiya University
  • Hoshi Fubuki
    Center for Weed and Wildlife Management, Utsunomiya University
  • Ogiso Yuki
    Center for Weed and Wildlife Management, Utsunomiya University
  • Kobayashi Hiroyuki
    Center for Weed and Wildlife Management, Utsunomiya University

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  • 北関東におけるマルバアメリカアサガオ（<i>Ipomoea hederacea</i> Jacq. var. <i>integriuscula</i> A.Gray）の畦畔からダイズほ場への侵入と種子散布を防ぐ管理技術
  • 北関東におけるマルバアメリカアサガオ(Ipomoea hederacea Jacq. var. integriuscula A.Gray)の畦畔からダイズほ場への侵入と種子散布を防ぐ管理技術
  • キタカントウ ニ オケル マルバアメリカアサガオ(Ipomoea hederacea Jacq. var. integriuscula A.Gray)ノ アゼ ハン カラ ダイズ ホジョウ エ ノ シンニュウ ト シュシ サンプ オ フセグ カンリ ギジュツ

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<p>Morning glories invade and disperse seeds from soybean field margins to adjacent fields. To verify whether the invasion and seed dispersal of morning glories could be prevented with additional weed management in September to farmer’s conventional management in field margins, entireleaf morningglory (Ipomoea hederacea Jacq. var. integriuscula A.Gray) was sown in experimental field margins adjacent to soybean fields. Two-treatment (June and August) and three-treatment (June, August, and September) with 48% glyphosate potassium salt solution and no-treatment methods were employed. The aboveground dry weight of the treated morning glory, invasion distance into the soybean field, and estimated number of seeds dispersed in the field were determined. The vines invaded up to the first (0.6 m from the field margins) and fourth (2.4 m) rows of the soybean fields under two-treatment and no-treatment, respectively, and seeds were dispersed under both treatments. Vines invaded up to the first row, but no seed was dispersed under three-treatment method.</p>

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