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Herbicide Resistance in MN and ND

Herbicide Resistance in MN and ND

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  • 1. Gly-R common ragweed Gly-R giant ragweed Gly-R waterhemp Black symbols: confirmed resistant cases; Blue: highly suspected Provided by: Drs. Jeff Stachler and Mike Christoffers Areas and counties of ND and MN having known and suspected glyphosate-resistant weeds 2006
  • 2. Gly-R common ragweed Gly-R giant ragweed Gly-R waterhemp Black symbols: confirmed resistant cases; Blue: highly suspected Provided by: Drs. Jeff Stachler and Mike Christoffers Areas and counties of ND and MN having known and suspected glyphosate-resistant weeds 2007
  • 3. Gly-R common ragweed Gly-R giant ragweed Gly-R waterhemp < 5% soybean fields gly-R C. Rag. 40 to 75% all acres have gly-R G. Rag. & 20 to 40% all acres have gly-R waterhemp 15 to 40% all acres gly-R C. Rag. Black symbols: confirmed resistant cases; Blue: highly suspected 5 to 20% all acres gly-R waterhemp Provided by: Drs. Jeff Stachler and Mike Christoffers Areas and counties of ND and MN having known and suspected glyphosate-resistant weeds 2008
  • 4. Gly-R common ragweed Gly-R giant ragweed Gly-R waterhemp 25 to 40% soybean fields gly-R C. Rag. 30 to 95% all acres have gly-R G. Rag. 30 to 60% all acres gly-R C. Rag. Black symbols: confirmed resistant cases; Blue: highly suspected 5 to 20% all acres gly-R waterhemp 10 to 30% soybean fields gly-R C. Rag. Provided by: Drs. Jeff Stachler and Mike Christoffers Areas and counties of ND and MN having known and suspected glyphosate-resistant weeds 2009
  • 5. Gly-R common ragweed Gly-R giant ragweed Gly-R waterhemp 25 to 40% soybean fields gly-R C. Rag. 50 to 95% all acres have gly-R G. Rag. 30 to 60% all acres gly-R C. Rag. Black symbols: confirmed resistant cases; Blue: highly suspected 5 to 80% all acres gly-R waterhemp 10 to 40% soybean fields gly-R C. Rag. Provided by: Drs. Jeff Stachler and Mike Christoffers Areas and counties of ND and MN having known and suspected glyphosate-resistant weeds 30 to 90% all acres have gly-R waterhemp 2010
  • 6. Waterhemp in RR soybean near Holloway, MN - 2010
  • 7. Giant ragweed in RR soybean in Renville, Co., MN - 2010
  • 8. Gly-R horseweed Gly-R kochia Gly-R common ragweed Gly-R giant ragweed Gly-R waterhemp 5 to 50% soybean fields gly-R C. Rag. 60 to 95% all acres have gly-R G. Rag. 30 to 60% all acres gly-R C. Rag. Black symbols: confirmed resistant cases; Blue: highly suspected 5 to 95% all acres gly-R waterhemp Provided by: Drs. Jeff Stachler and Mike Christoffers Areas and counties of ND and MN having known and suspected glyphosate-resistant weeds 70 to 95% all acres have gly-R waterhemp 2011 70 to 95% all acres gly-R C. Rag. 5 to 70% all acres gly-R G. Rag. & waterhemp
  • 9. Near Princeburg, MN - 2011
  • 10. On Hwy 12 between Willmar and Benson, MN - 2011
  • 11. Galchutt, ND - 2011
  • 12. Galchutt, ND - 2011
  • 13. Moorhead, MN - 2011
  • 14. SE of Shelly, MN - 2011
  • 15. E. of Nielsville, MN - 2011
  • 16. SW Traill Co., ND - 2011
  • 17. Observations from ND and Manitoba fields Herbicide Resistance:
  • 18. Observations from ND and Manitoba fields Herbicide Resistance:
  • 19. Susceptible Wild Oat (Avena fatua) Endangered in Manitoba (Beckie et al. 2010)
  • 20. Susceptible Wild Oat (Avena fatua) Endangered in Manitoba (Beckie et al. 2010)
  • 21. Susceptible Wild Oat (Avena fatua) Endangered in Manitoba (Beckie et al. 2010)
  • 22. Susceptible Wild Oat (Avena fatua) Endangered in Manitoba (Beckie et al. 2010)
  • 23. Untreated Everest Puma Axial Select Assure II TG Sample A 4 weeks after treatment Seed collected in 2009
  • 24. Untreated Everest Puma Axial Select Assure II TG Sample B 4 weeks after treatment Seed collected in 2009
  • 25. Untreated Everest Puma Axial Select Assure II RS 4 weeks after treatment Seed collected in 2009
  • 26. Untreated Everest Puma Axial Select Assure II JC 4 weeks after treatment Seed collected in 2009
  • 27. 3 weeks after treatment Untreated Axial Goldsky Select Puma Susceptible Wild oat
  • 28. 3 weeks after treatment Untreated Axial Goldsky Select Puma KDJ U Wild oat
  • 29. Field perimeter management (2010)
  • 30. Ramifications of not managing field perimeter (2011)