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1 April 2012 Comparison of Herbicide Tactics to Minimize Species Shifts and Selection Pressure in Glyphosate-Resistant Soybean
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There are significant concerns over the long- and short-term implications of continuous glyphosate use and potential problems associated with weed species shifts and the development of glyphosate-resistant weed species. Field research was conducted to determine the effect of herbicide treatment and application timing on weed control in glyphosate-resistant soybean. Ten herbicide treatments were evaluated that represented a range of PPI, PRE, and POST-only application timings. All herbicide treatments included a reduced rate of glyphosate applied POST. PRE herbicides with residual properties followed by (fb) glyphosate POST provides more effective control of broadleaf weed species than POST-only treatments. There was no difference in soybean yield between PRE fb POST and POST-only treatments in 2008. Conversely, PRE fb POST herbicide treatments resulted in greater yield than POST-only treatments in 2009. Using PRE fb POST herbicide tactics improves weed control and reduces the risk for crop yield loss when dealing with both early- and late-emerging annual broadleaf weed species across variable cropping environments.

Nomenclature: Glyphosate; common lambsquarters, Chenopodium album L. CHEAL; common waterhemp, Amaranthus rudis Sauer AMATA; giant ragweed, Ambrosia trifida L., AMBTR.

Weed Science Society of America
Gregg Johnson, Fritz Breitenbach, Lisa Behnken, Ryan Miller, Tom Hoverstad, and Jeffrey Gunsolus "Comparison of Herbicide Tactics to Minimize Species Shifts and Selection Pressure in Glyphosate-Resistant Soybean," Weed Technology 26(2), 189-194, (1 April 2012).
Received: 20 July 2011; Accepted: 1 December 2011; Published: 1 April 2012

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