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

Taghi Bararpour, Ralph R. Hale, Gurpreet Kaur, Jason A. Bond, Nilda R. Burgos, Te-Ming P. Tseng, Tessie H. Wilkerson and Lauren M. Lazaro
Additional contact information
Taghi Bararpour: Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, Stoneville, MS 38776, USA
Ralph R. Hale: Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, Stoneville, MS 38776, USA
Gurpreet Kaur: Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, Stoneville, MS 38776, USA
Jason A. Bond: Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, Stoneville, MS 38776, USA
Tessie H. Wilkerson: Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, Stoneville, MS 38776, USA

Agriculture, 2018, vol. 8, issue 9, 1-11

Abstract: 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.

Keywords: flufenacet; metribuzin; chlorsulfuron; mesosulfuron; metsulfuron (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2018
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