Weed Technology (2007) 21, 225-229

Bhagirath S. Chauhan, Gurjeet S. Gill and Christopher Preston (2007)
Timing and dose of metolachlor affect rigid ryegrass (Lolium rigidum) control in wheat
Weed Technology 21 (1), 225-229
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 0.96kg ai/ha was applied at 40 or 46d (very early preplant, VEPP) and 20 or 23d 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 0.96kg/ha than at 0.48kg/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 0.48kg/ha could be safely applied around 20d before crop sowing to selectively control rigid ryegrass in wheat.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Bhagirath Singh Chauhan, Christopher Preston

Research topic(s) for pests/diseases/weeds:
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Lolium rigidum (weed)	Wheat (Triticum)	Australia (South+SE)