Weed control in dwarf cogongrass (<i>Imperata cylindrica</i> (L.) Beauv. var. <i>koenigii</i> (Retz.) Durand et Schinz) fields by herbicides

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  • 除草剤による矮性チガヤ圃場の雑草管理
  • ジョソウザイ ニ ヨル ワイセイ チガヤ ホジョウ ノ ザッソウ カンリ

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Abstract

<p>To better understand which herbicides were best suited for controlling weeds in Dwarf cogongrass (Imperata cylindrica (L.) Beauv. ‘Hajime’) field, their safeties to Dwarf Cogongrass and herbicidal activities against a variety of weeds were investigated using pot and field test. The results of pot test in a greenhouse showed that of 18 herbicides tested, six could be used with Dwarf cogongrass; three were effective pre-emergence herbicides (S-metolachlor, pyroxasulfone, triaziflam) and three were effective post-emergence herbicides (harosulfuron-methyl, atrazine, triclopyr). The findings obtained from field test showed that the two sequential applications, S-metolachlor/harosulfuron-methyl and S-metolachlor/atrazine, are effective for control weeds without damaging Dwarf cogongrass when S-metolachlor was applied as a pre-emergence herbicide at a rate of 300 g a.i./10 a, followed by harosulfuron-methyl as a post-emergence herbicide at a rate of 100 g a.i./10 a and/or atrazine as a post-emergence herbicide at a rate of 300 g a.i./10 a.</p>

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