Using diclosulam for yellow (Cyperus esculentus L.) And purple (Cyperus rotundus L.) Nutsedge control in peanut (Arachis hypogaea L.)
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Field studies were conducted in several peanut (Arachis hypogaea L.) growing areas of Texas to evaluate yellow (Cyperus esculentus L.) and purple nutsedge (Cyperus rotundus L.) control and peanut response to diclosulam applied either preplant incorporated (PPI), preemergence (PRE), or postemergence (POST) or diclosulam applied PRE followed by imazapic, imazethapyr, or paraquat plus bentazon combinations applied POST. Diclosulam at 0.018 and 0.027 kg ai/ha caused 7 to 33% stunting in west Texas but peanut injury was not observed in south and central Texas. In west Texas, yellow nutsedge was controlled 47 to 71% following diclosulam while imazapic and imazethapyr alone provided 86 to 97% and 55 to 87% control, respectively. Diclosulam followed by either bentazon or paraquat plus bentazon controlled yellow nutsedge 58 to 87% while diclosulam followed by either imazapic or imazethapyr controlled this weed 83 to 95%. In south Texas, under extremely dense yellow nutsedge pressure, diclosulam at 0.009 to 0.022 kg ai/ha applied either PPI, PRE, or POST or imazapic applied POST provided less than 55% yellow nutsedge control. In central Texas under moderate yellow nutsedge pressure, control with diclosulam at 0.009 kg/ha was greatest with the PRE application (83%). Diclosulam at 0.018 and 0.022 kg/ha applied PPI or PRE controlled yellow nutsedge 82 to 87% while the same rates of diclosulam applied POST controlled yellow nutsedge 60 to 72%. Purple nutsedge control was greatest with diclosulam at 0.022 kg/ha regardless of application method. Nutsedge control with diclosulam was never more effective than imazapic. 2008 Nova Science Publishers, Inc. All Rights Reserved.