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Glyphosate-resistant Giant Ragweed(Ambrosia trifida L.)in Ontario:Dose Response and Control with Postemergence herbicides

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American Journal of Plant Sciences 2012年第5期3卷 608-617页

作者： Joseph P.Vink Nader Soltani Darren E.Robinson Francois J.Tardif Mark B.Lawton Peter H.Sikkema University of Guelph Ridgetown CampusRidgetownCanada University of Guelph GuelphCanada Monsanto Canada GuelphCanada

Giant ragweed (Ambrosia trifida L.) is competitive with agronomic crops and can cause significant yield losses. Rapid adoption of glyphosate-resistant (GR) crops and a concomitant increase in the reliance on glyphosate for weed management has led to the evolution of GR giant ragweed in Ontario, Canada. Field studies were conducted to evaluate the level of resistance in giant ragweed biotypes from Ontario, and to evaluate the effectiveness of various postemer-gence (POST) herbicides in soybean (Glycine max L.). The effective dose (ED) to provide 50%, 80% and 95% giant ragweed control was up to 1658, 9991 and >43200 g?a.e.?ha–1 4 weeks after application (WAA), respectively. For effective control, growers would need to apply glyphosate 18 times greater than the recommended field application dose. Glyphosate applied at the recommended field dose of 900 g?a.e.?ha–1 provided up to 57% control and resulted in soybean yield equivalent to the weedy check. Cloransulam-methyl applied POST provided up to 99% control, reduced giant ragweed density 98%, reduced giant ragweed shoot dry weight 99% and resulted in soybean yield equivalent to the weedfree check. Chlorimuron-ethyl, fomesafen, imazethapyr and imazethapyr plus bentazon applied alone or with glyphosate did not provide adequate control of GR giant ragweed. Based on these results, some GR giant ragweed biotypes from Ontario have evolved a high level of resistance to glyphosate. Cloransulam-methyl applied POST was the only herbicide that provided adequate control and suggests that additional weed management tactics will need to be implemented in order to effectively manage GR giant ragweed.

关键词： Bentazon Chlorimuron-Ethyl Cloransulam-Methyl Fomesafen Glyphosate-resistant Crops herbicide-resistant weeds Imazethapyr Soybean

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Control of glyphosate resistant giant ragweed in soybean with preplant herbicides

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Agricultural Sciences 2013年第4期4卷 195-205页

作者： Joanna Follings Nader Soltani Darren E.Robinson Francois J.Tardif Mark B.Lawton Peter H.Sikkema University of Guelph Ridgetown Campus RidgetownCanada University of Guelph GuelphCanada Monsanto Canada Inc. GuelphCanada

Giant ragweed was the first glyphosate resistant weed identified in Canada. It is a very competetive weed in row crop production and has been found to drastically reduce yields of soybean;therefore, control of this competitive weed is essential. The objective of this study was to determine effective control options for glyphosate resistant giant ragweed in soybean with herbicides applied preplant. Eighteen herbicide combinations were evaluated in field studies conducted in 2011 and 2012 at five locations with confirmed glyphosate resistant giant ragweed. Glyphosate plus 2,4-D ester or amitrole provided the best control of glyphosate resistant giant ragweed 4 WAA. Glyphosate plus 2,4-D ester provided 98 to 99% control and was equivalent to the weed free check at all locations. Glyphosate plus amitrole provided 90% to 93% control and was equivalent to the weed free check at 4 of 5 locations. herbicides providing residual activity provided variable control across all locations. Of the herbicides with residual activity evaluated, glyphosate plus linuron provided the best control of glyphosate resistant giant ragweed;however, control was inconsistent across locations and years. Glyphosate plus linuron provided 23% to 99% controland was equal to the weed free check at one location 8 WAA.

关键词： Chlorimuron-Ethyl Cloransulam-Methyl Flumioxazin herbicide-resistant weeds Imazethapyr Linuron Metribuzin Saflufenacil/Dimethenamid-P Soybean

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