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Control of glyphosate resistant giant ragweed in soybean with preplant herbicides

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DOI: 10.4236/as.2013.44028    3,443 Downloads   5,272 Views   Citations

ABSTRACT

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.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Follings, J. , Soltani, N. , Robinson, D. , Tardif, F. , Lawton, M. and Sikkema, P. (2013) Control of glyphosate resistant giant ragweed in soybean with preplant herbicides. Agricultural Sciences, 4, 195-205. doi: 10.4236/as.2013.44028.

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