Comparison of herbicide tactics to minimize species shifts and selection pressure in glyphosate-resistant soybean

Gregg Johnson, Fritz Breitenbach, Lisa M Behnken, Ryan P Miller, Tom Hoverstad, Jeffrey L Gunsolus

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)189-194
Number of pages6
JournalWeed Technology
Volume26
Issue number2
DOIs
StatePublished - Apr 1 2012

Keywords

  • Preemergence herbicides
  • herbicide resistance
  • postemergence herbicides

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