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1 April 2011 Imazethapyr plus Propanil Programs in Imidazolinone-Resistant Rice
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Field studies were conducted in 2008 and 2009 near Crowley, Louisiana, to evaluate the addition of different propanil formulations in mixture with a standard imazethapyr program of 70 g ai ha−1 early postemergence followed by (fb) 70 g ha−1 late postemergence. Weeds evaluated included red rice, barnyardgrass, Texasweed, and alligatorweed. Control of all species with treatments, including a propanil formulation applied at 3,400 g ai ha−1, was equivalent to, or greater than, the standard imazethapyr program. Rough rice yield and economic returns were maximized when the propanil formulations of Propanil 1 or Propanil 3 were mixed with imazethapyr in the early postemergence applications. The addition of propanil to imazethapyr increased rough rice yield and economic returns because of improved weed control.

Nomenclature: Imazethapyr; propanil; alligatorweed, Althernanthera philoxeroides (Mart.) Griseb.; barnyardgrass, Echinochloa crus-galli (L.) Beauv; red rice, Oryza sativa L.; Texasweed, Caperonia palustris (L.) St. Hil

Tyler P. Carlson, Eric P. Webster, Michael E. Salassi, Justin B. Hensley, and David C. Blouin "Imazethapyr plus Propanil Programs in Imidazolinone-Resistant Rice," Weed Technology 25(2), 204-211, (1 April 2011).
Received: 3 September 2010; Accepted: 1 January 2011; Published: 1 April 2011

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