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Comparison of Herbicides for Control of Diclofop-Resistant Italian Ryegrass in Wheat

Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, Stoneville, MS 38776, USA
Author to whom correspondence should be addressed.
Agriculture 2018, 8(9), 135;
Received: 31 July 2018 / Revised: 23 August 2018 / Accepted: 24 August 2018 / Published: 1 September 2018
Diclofop-resistant Italian ryegrass (Lolium perenne L. ssp. Multiflorum (Lam.) Husnot) is a dominant weed problem in non-irrigated winter wheat (Triticum aestivum L.) in mid-south USA. Field studies were conducted from 2001 to 2007 to evaluate the efficacy of herbicides for diclofop-resistant ryegrass control and effect on wheat yield. In 2001 through 2004, chlorsulfuron/metsulfuron at 0.026 kg ha−1 preemergence (PRE) followed by (fb) mesosulfuron at 0.048 kg ha−1 at 4-leaf to 2-tiller ryegrass provided 89% control of diclofop-resistant Italian ryegrass, resulting in the highest wheat yield (3201 kg ha−1). Flufenacet/metribuzin at 0.476 kg ha−1 applied at 1- to 2-leaf wheat had equivalent Italian ryegrass control (87%), but lesser yield (3013 kg ha−1). In 2005–2006, best treatments for Italian ryegrass control were chlorsulfuron/metsulfuron, 0.013 kg ha−1 PRE fb mesosulfuron 0.015 kg ha−1 at 3- to 4-leaf ryegrass (92%); metribuzin, 0.280 kg ha−1 at 2- to 3- leaf wheat fb metribuzin at 2- to 3-tiller ryegrass (94%); chlorsulfuron/metsulfuron (0.026 kg ha−1) (89%); and flufenacet/metribuzin at 1- to 2-leaf wheat (89%). Chlorsulfuron/metsulfuron fb mesosulfuron provided higher yield (3515 kg ha−1) than all other treatments, except metribuzin fb metribuzin. View Full-Text
Keywords: flufenacet; metribuzin; chlorsulfuron; mesosulfuron; metsulfuron flufenacet; metribuzin; chlorsulfuron; mesosulfuron; metsulfuron
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Bararpour, T.; Hale, R.R.; Kaur, G.; Bond, J.A.; Burgos, N.R.; Tseng, T.-M.P.; Wilkerson, T.H.; Lazaro, L.M. Comparison of Herbicides for Control of Diclofop-Resistant Italian Ryegrass in Wheat. Agriculture 2018, 8, 135.

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