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|Title:||Timing and dose of metolachlor affect rigid ryegrass (Lolium rigidum) control in wheat|
|Citation:||Weed Technology, 2007; 21(1):225-229|
|Publisher:||Weed Sci Soc Amer|
|Bhagirath S. Chauhan, Gurjeet S. Gill, and Christopher Preston|
|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.|
|Keywords:||Weed control; Weed emergence|
|Description:||© 2008 Weed Science Society of America. All rights reserved.|
|Appears in Collections:||Agriculture, Food and Wine publications|
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