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Italian Ryegrass (Lolium multiflorum) Control in Imidazolinone-Resistant Wheat

Published online by Cambridge University Press:  20 January 2017

Kevin C. Clemmer ,
Alan C. York  and
Cavell Brownie
Kevin C. Clemmer
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
Alan C. York*
Affiliation:
Department of Crop Science, North Carolina State University, Raleigh, NC 27695-7620
Cavell Brownie
Affiliation:
Department of Statistics, North Carolina State University, Raleigh, NC 27695-8203
*
Corresponding author's E-mail: alan_york@ncsu.edu
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Abstract

Imazamox ammonium salt at 53 g ae/ha applied postemergence in the fall to imidazolinone-resistant wheat controlled Italian ryegrass 98 to 100% 10 wk after treatment (WAT). Control 22 WAT was 88 to 98% at two locations and 55% at a third location. Imazamox was more effective applied in fall to three- to four-leaf Italian ryegrass than when applied in spring to one- to three-tiller Italian ryegrass. Split applications, with 27 g/ha applied in fall and spring, were no more effective than 53 g/ha applied in fall. Pendimethalin preemergence in combination with fall-applied imazamox increased control 22 WAT 10 to 33 percentage points at two of three locations. Imazethapyr ammonium salt plus imazapyr isopropylamine salt applied at 47 plus 16 g ae/ha and imazamox at 44 or 53 g/ha were similarly effective, whereas imazethapyr at 70 g/ha was ineffective. Control by imazapic ammonium salt at 70 g ae/ha was equal to or greater than control by imazamox at 44 or 53 g/ha. Imazamox, imazethapyr plus imazapyr, and imazapic controlled diclofop-resistant and -susceptible Italian ryegrass. Thifensulfuron plus tribenuron mixed with imazamox increased Italian ryegrass control in field and greenhouse experiments, whereas dicamba reduced control compared with imazamox applied alone. Control by imazamox plus 2,4-D was similar to or greater than control by imazamox alone.

Keywords

Dicambadiclofopimazamoximazapicimazapyrimazethapyrimidazolinoneisopropylaminependimethalinthifensulfurontribenuron2,4-DItalian ryegrass, Lolium multiflorum Lam. Marshall # LOLMUwheat, Triticum aestivum L.Herbicide interactionsherbicide-resistant weedsweed managementDAT, days after treatmentI80, rate required for 80% visible control or 80% fresh weight reductionIR, imidazolinone-resistantPOST, postemergencePRE, preemergenceWAT, weeks after treatment.
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 481 - 489
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: North Carolina Department of Transportation, Roadside Environmental Unit, 1557 Mail Service Center, Raleigh, NC 27699-1557

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