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Control of Italian Ryegrass (Lolium multiflorum) in Winter Wheat

Published online by Cambridge University Press:  20 January 2017

Aaron J. Hoskins ,
Bryan G. Young ,
Ronald F. Krausz  and
John S. Russin
Aaron J. Hoskins
Affiliation:
Department of Plant, Soil and Agricultural Systems, Center for Excellence in Soybean Research, Teaching, and Outreach, Southern Illinois University, 1205 Lincoln Drive, MC-4415, Carbondale, IL 62901
Bryan G. Young*
Affiliation:
Department of Plant, Soil and Agricultural Systems, Center for Excellence in Soybean Research, Teaching, and Outreach, Southern Illinois University, 1205 Lincoln Drive, MC-4415, Carbondale, IL 62901
Ronald F. Krausz
Affiliation:
Department of Plant, Soil and Agricultural Systems, Center for Excellence in Soybean Research, Teaching, and Outreach, Southern Illinois University, 1205 Lincoln Drive, MC-4415, Carbondale, IL 62901
John S. Russin
Affiliation:
Department of Plant, Soil and Agricultural Systems, Center for Excellence in Soybean Research, Teaching, and Outreach, Southern Illinois University, 1205 Lincoln Drive, MC-4415, Carbondale, IL 62901
*
Corresponding author's E-mail: bgyoung@siu.edu
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Abstract

Field studies were established in 1999 and 2000 to evaluate Italian ryegrass, wheat, and double-crop soybean response to fall and spring postemergence applications of flucarbazone, sulfosulfuron, clodinafop, diclofop, and tralkoxydim applied alone and in combination with thifensulfuron + tribenuron to winter wheat. Fall-applied herbicides caused 5% or less wheat injury. Spring-applied herbicides caused 3 to 45% wheat injury, and the greatest injury occurred with the combination of flucarbazone with thifensulfuron + tribenuron in the spring of 2001. Spring-applied sulfosulfuron, tralkoxydim, diclofop, and clodinafop caused 3 to 6% and 16 to 26% wheat injury in 2000 and 2001, respectively. Herbicide injury to wheat did not reduce wheat grain yield compared with the hand-weeded treatment. Italian ryegrass competition in the nontreated plots reduced wheat yield by as much as 33% compared with herbicide-treated plots. Italian ryegrass control was 89 to 99% from clodinafop and diclofop and 78 to 97% from flucarbazone, with no differences because of application timing in either year of the study. Italian ryegrass control from sulfosulfuron and tralkoxydim was greater from the spring of 2000 applications (94 to 99%) compared with the fall of 1999 applications (65 to 88%). However, in 2001, application timing (fall vs. spring) for sulfosulfuron and tralkoxydim did not affect Italian ryegrass control. Thifensulfuron + tribenuron combined with tralkoxydim reduced control of Italian ryegrass control compared with tralkoxydim alone in both years of the study. Italian ryegrass control was not reduced when thifensulfuron + tribenuron was combined with sulfosulfuron, flucarbazone, diclofop, or clodinafop. Italian ryegrass was controlled effectively by the acetyl-CoA carboxylase–inhibiting herbicides diclofop, clodinafop, and tralkoxydim. However, control of Italian ryegrass with the acetolactate synthase–inhibiting herbicides flucarbazone and sulfosulfuron was inconsistent. Double-crop soybean after wheat did not have foliar symptoms or yield loss from fall- or spring-applied herbicides.

Keywords

ClodinafopdiclofopflucarbazonesulfosulfuronthifensulfurontralkoxydimtribenuronItalian ryegrass, Lolium multiflorum Lam., Marshall # LOLMUsoybean, Glycine max (L.) Merr, ‘BT369CR’wheat, Triticum aestivum L., ‘Pioneer 25R26’Application timingherbicide carryovertank mixturesALS, acetolactate synthase (EC 4.1.3.18)DAT, days after treatmentPOST, postemergence
Type
Research Article
Information
Weed Technology , Volume 19 , Issue 2 , June 2005 , pp. 261 - 265
Copyright
Copyright © Weed Science Society of America 

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