Gly-R common ragweedGly-R giant ragweedGly-R waterhemp

Black symbols: confirmed resistant cases; Blue: highly suspectedProvided by: Drs. Jeff Stachler and Mike Christoffers

Areas and counties of ND and MN havingknown and suspected glyphosate-resistant weeds

2006

Gly-R common ragweedGly-R giant ragweedGly-R waterhemp

Black symbols: confirmed resistant cases; Blue: highly suspectedProvided by: Drs. Jeff Stachler and Mike Christoffers

Areas and counties of ND and MN havingknown and suspected glyphosate-resistant weeds

2007

Gly-R common ragweedGly-R giant ragweedGly-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-RC. Rag.

Black symbols: confirmed resistant cases; Blue: highly suspected

5 to 20% all acresgly-R waterhemp

Provided by: Drs. Jeff Stachler and Mike Christoffers

Areas and counties of ND and MN havingknown and suspected glyphosate-resistant weeds

2008

Gly-R common ragweedGly-R giant ragweedGly-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-RC. Rag.

Black symbols: confirmed resistant cases; Blue: highly suspected

5 to 20% all acresgly-R waterhemp

10 to 30% soybean fieldsgly-R C. Rag.

Provided by: Drs. Jeff Stachler and Mike Christoffers

Areas and counties of ND and MN havingknown and suspected glyphosate-resistant weeds

2009

Gly-R common ragweedGly-R giant ragweedGly-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-RC. Rag.

Black symbols: confirmed resistant cases; Blue: highly suspected

5 to 80% all acresgly-R waterhemp

10 to 40% soybean fieldsgly-R C. Rag.

Provided by: Drs. Jeff Stachler and Mike Christoffers

Areas and counties of ND and MN havingknown and suspected glyphosate-resistant weeds

30 to 90% all acres have gly-R waterhemp

2010

Dr. Jeff Stachler

Waterhemp in RR soybean near Holloway, MN - 2010

Dr. Jeff Stachler

Giant ragweed in RR soybean in Renville, Co., MN - 2010

Gly-R horseweedGly-R kochiaGly-R common ragweedGly-R giant ragweedGly-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-RC. Rag.

Black symbols: confirmed resistant cases; Blue: highly suspected

5 to 95% all acresgly-R waterhemp

Provided by: Drs. Jeff Stachler and Mike Christoffers

Areas and counties of ND and MN havingknown and suspected glyphosate-resistant weeds

70 to 95% all acres have gly-R waterhemp

2011

70 to 95% all acres gly-RC. Rag.

5 to 70% all acres gly-RG. Rag. & waterhemp

Dr. Jeff Stachler

Near Princeburg, MN - 2011

Dr. Jeff Stachler

On Hwy 12 between Willmar and Benson, MN - 2011

Dr. Jeff Stachler

Galchutt, ND - 2011

Dr. Jeff Stachler

Galchutt, ND - 2011

Dr. Jeff Stachler

Moorhead, MN - 2011

Dr. Jeff Stachler

SE of Shelly, MN - 2011

Dr. Jeff Stachler

E. of Nielsville, MN - 2011

Dr. Jeff Stachler

SW Traill Co., ND - 2011

Dr. Jeff Stachler

Observations from ND and Manitoba fields

Herbicide Resistance:

Observations from ND and Manitoba fields

Herbicide Resistance:

Susceptible Wild Oat (Avena fatua) Endangered in Manitoba (Beckie et al. 2010)

Susceptible Wild Oat (Avena fatua) Endangered in Manitoba (Beckie et al. 2010)

Susceptible Wild Oat (Avena fatua) Endangered in Manitoba (Beckie et al. 2010)

Susceptible Wild Oat (Avena fatua) Endangered in Manitoba (Beckie et al. 2010)

Untreated Everest Puma Axial Select Assure II

TG Sample A

4 weeks after treatment

Seed collected in 2009

Untreated Everest Puma Axial Select Assure II

TG Sample B

4 weeks after treatment

Seed collected in 2009

Untreated Everest Puma Axial Select Assure II

RS

4 weeks after treatment

Seed collected in 2009

Untreated Everest Puma Axial Select Assure II

JC

4 weeks after treatment

Seed collected in 2009

3 weeks after treatment

Untreated Axial Goldsky Select Puma

Susceptible

Wild oat

3 weeks after treatment

Untreated Axial Goldsky Select Puma

KDJ U

Wild oat

Dr. Jeff Stachler

Field perimeter management (2010)

Dr. Jeff Stachler

Ramifications of not managing field perimeter (2011)