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Timing and Dose of Metolachlor Affect Rigid Ryegrass (Lolium rigidum) Control in Wheat

Published online by Cambridge University Press:  20 January 2017

Bhagirath S. Chauhan ,
Gurjeet S. Gill  and
Christopher Preston
Bhagirath S. Chauhan*
Affiliation:
Discipline of Agricultural and Animal Science, The University of Adelaide, Roseworthy Campus, South Australia 5371
Gurjeet S. Gill
Affiliation:
Discipline of Agricultural and Animal Science, The University of Adelaide, Roseworthy Campus, South Australia 5371
Christopher Preston
Affiliation:
Discipline of Plant and Food Science, The University of Adelaide, Waite Campus, South Australia 5064
*
Corresponding author's E-mail: b.chauhan2@cgiar.org
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Abstract

The efficacy of metolachlor on rigid ryegrass was determined under a no-till seeding system in an experiment conducted in 2004 and 2005 in South Australia. Metolachlor at a rate of 0.48 and 0.96 kg ai/ha was applied at 40 or 46 d (very early preplant, VEPP) and 20 or 23 d before crop sowing (early preplant, EPP), and at sowing (preplant, PP) in 2004 and 2005; the herbicide was incorporated by sowing. The control of rigid ryegrass was greater than 80% when metolachlor was applied PP; however, that application resulted in phytotoxic effects on emergence and yield of wheat; metolachlor was more phytotoxic when applied at 0.96 kg/ha than at 0.48 kg/ha. Metolachlor applied EPP provided 71 to 83% rigid ryegrass control, whereas VEPP application provided only 33 to 49% control. Reduction in wheat grain yield was not observed at these application times. This study indicates that metolachlor at 0.48 kg/ha could be safely applied around 20 d before crop sowing to selectively control rigid ryegrass in wheat.

Keywords

Metolachlorrigid ryegrass, Lolium rigidum Gaud. LOLRIwheat, Triticum aestivum L. ‘Krichauff’Weed controlweed emergence
Type
Research
Information
Weed Technology , Volume 21 , Issue 1 , March 2007 , pp. 225 - 229
Copyright
Copyright © Weed Science Society of America 

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References

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