Chemical control of <i>Ipomoea hederacea</i> var. <i>integriuscula</i> using imazamox ammonium salt in narrow-row soybean in southwestern Japan

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  • Asami Hidenori
    Western Region Agricultural Research Center, NARO Graduate School of Agricultural Science, Tohoku University
  • Tachibana Masaaki
    Western Region Agricultural Research Center, NARO
  • Homma Koki
    Graduate School of Agricultural Science, Tohoku University

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  • 温暖地のダイズ狭畦栽培におけるイマザモックスアンモニウム塩を導入したマルバアメリカアサガオの防除
  • オンダンチ ノ ダイズキョウアゼ サイバイ ニ オケル イマザモックスアンモニウムエン オ ドウニュウ シタ マルバアメリカアサガオ ノ ボウジョ

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Abstract

<p>In Japan, the spread of morning glory (Ipomoea spp.) in soybean fields has become a serious problem, thus necessitating the establishment of an effective control method. Therefore, in this study, we sought to clarify the optimum application system of imazamox ammonium salt (IAS) with bentazone to control the spread of morning glory and to investigate the associated degree of phytotoxicity in soybean. Field experiments were conducted from 2017 to 2019, using I. hederacea (L.) Jacq. var. integriuscula A. Gray as the target control species. Dry matter weight of I. hederacea var. integriuscula tended to decrease in autumn, causing a delay in the timing of IAS application. The application at the second trifoliate leaf stage (TLS) of soybean was the most effective. The control rate was higher when what is combined with bentazone; systematic application of IAS and bentazone at the first and third–fourth TLS of soybean was the most effective control strategy. We detected no statistically significant reduction in soybean yield as a consequence of IAS application. However, we noted marked differences in the annual yield; it decreased by approximately 27% in 2019. This reduction in soybean yield is attributable to a delayed flowering period and the observed reduction in the total numbers of nodes, pods, and grains due to the damage caused by IAS. Furthermore, we speculate that a low temperature and sunshine duration after IAS application contributed to phytotoxicity in soybean.</p>

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