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首页> 外文期刊>Weed technology: A journal of the Weed Science Society of America >Palmer Amaranth (Amaranthus palmeri) Control by Glufosinate plus Fluometuron Applied Postemergence to WideStrike~R Cotton
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Palmer Amaranth (Amaranthus palmeri) Control by Glufosinate plus Fluometuron Applied Postemergence to WideStrike~R Cotton

机译：Palmer Amaranth (Amaranthus palmeri) Control by Glufosinate plus Fluometuron Applied Postemergence to WideStrike~R Cotton

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Glyphosate-resistant (GR) weeds, especially GR Palmer amaranth, are very problematic for cotton growers in the Southeast and Midsouth regions of the United States. Glufosinate can control GR Palmer amaranth, and growers are transitioning to glufosinate-based systems. Palmer amaranth must be small for consistently effective control by glufosinate. Because this weed grows rapidly, growers are not always timely with applications. With widespread resistance to acetolactate synthase-inhibiting herbicides,growers have few herbicide options to mix with glufosinate to improve control of larger weeds. In a field study using a WideStrike cotton cultivar, we evaluated fluometuron at 140 to 1,120 g ai ha~(-1) mixed with the ammonium salt of glufosinate at 485g ae ha~(-1) for control of GR Palmer amaranth 13 and 26 cm tall. Standard PRE- and POST-directed herbicides were included in the systems. Glufosinate alone injured the WideStrike~R cotton less than 10. Fluometuron increased injury up to 25 but did notadversely affect yield. Glufosinate controlled 13-cm Palmer amaranth at least 90 , and there was no improvement in weed control nor a cotton yield response to fluometuron mixed with glufosinate. Palmer amaranth 26 cm tall was controlled only 59 by glufosinate. Fluometuron mixed with glufosinate increased control of the larger weeds up to 28 and there was a trend for greater yields. However, delaying applications until weeds were 26 cm reduced yield 22 relative to timely application. Our results suggest fluometuron mixed with glufosinate may be of some benefit when attempting to control large Palmer amaranth. However, mixing fluometuron with glufosinate is not a substitute for a timely glufosinate application.

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