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1 July 2008 Transplanted Onion Response to Previously Applied Residual Herbicides
Timothy L. Grey, Andrew MacRae, A Stanley Culpepper
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Field trials were conducted in 2003/2004 and 2005/2006 at Reidsville, Georgia, to evaluate the effects of previously applied residual herbicides on onion growth and bulb production. Before transplanting onion, preplant applications of imazapic at 18 and 36 g ai/ha, diclosulam at 7 and 14 g ai/ha, pyrithiobac at 27 and 54 g ai/ha, trifloxysulfuron at 6.6 and 13.2 g ai/ha, diuron at 224 and 448 g ai/ha, and cloransulam at 22 g ai/ha were made. An untreated control was included for comparison. Trifloxysulfuron at 13.2 g/ha, diclosulam at 14 g/ha, pyrithiobac at 54 g/ha, and cloransulam at 22 g/ha injured onion 26, 73, 86, and 86% in 2003/2004, respectively, and 13 to 44% injury in 2005/2006. These same herbicides also reduced yield. Imazapic and diuron injured transplanted onion 6% during both seasons but did not reduce yield. This research suggests imazapic and diuron restrictions could possibly be reduced. However, the onion rotational restrictions for diclosulam, pyrithiobac, trifloxysulfuron, and cloransulam are accurate.

Nomenclature: Cloransulam, 3-chloro-2-[[(5-ethoxy-7-fluoro[1,2,4]triazolo[1,5-c]pyrimidin-2yl)sulfonyl]amino]benzoic acid; diclosulam; imazapic; trifloxysulfuron; onion, Allium cepa L

Timothy L. Grey, Andrew MacRae, and A Stanley Culpepper "Transplanted Onion Response to Previously Applied Residual Herbicides," Weed Technology 22(3), 477-480, (1 July 2008).
Received: 1 February 2008; Accepted: 1 March 2008; Published: 1 July 2008

Crop injury
herbicide persistence
multiple cropping
simulated carryover
soil-applied herbicides
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