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Glyphosate Stewardship: Enhancing Weed Management with PSEP

This presentation by Chris Boerboom, Extension Weed Scientist at the University of Wisconsin-Madison, explores the importance of glyphosate stewardship in agriculture. It highlights the benefits of glyphosate technologies, including broad-spectrum weed control, crop safety, and environmental favorability. The session examines the rise of glyphosate-resistant weeds in the U.S. and discusses strategies for effective weed management, stressing the importance of diversifying herbicide use and integrating programs to mitigate herbicide resistance.

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Glyphosate Stewardship: Enhancing Weed Management with PSEP

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Presentation Transcript

  1. It’s Time for Glyphosate StewardshipCan PSEP Help? Chris Boerboom Extension Weed Scientist University of Wisconsin-Madison

  2. Glyphosate Technologies Burndown treatments in no-till

  3. Glyphosate Technologies • Glyphosate-resistant crops • in-season glyphosate use Benefits  Broad spectrum weed control  Crop safety  Rotational crop flexibility  Environmentally favorable

  4. What is Herbicide Resistance?

  5. Confirmed Glyphosate Resistant Weeds in the US(2006) Horseweed (Marestail) Common Ragweed Italian Ryegrass Rigid Ryegrass Palmer Amaranth Common Waterhemp Giant Ragweed

  6. Glyphosate Resistant Weeds in the US Giant ragweed Waterhemp Palmer amaranth Italian ryegrass Common ragweed Horseweed Rigid ryegrass

  7. "Stupidity is doing the same thing over and over again expecting different results"  ~ A. Einstein

  8. Horseweed or “Marestail” Photo credit: Larry Steckel

  9. 2004 Common Horseweed Burndown Program Photo credit: Larry Steckel

  10. California: Glyphosate-resistant horseweed on a ditch-bank

  11. Common Ragweed 96 oz/a WeatherMax York, NCSU

  12. WeatherMax 22 oz, 2 d after application to 16 inch Palmer

  13. Palmer Amaranth WeatherMax 88 oz at 1 inch WeatherMax 88 oz at 4 inch WeatherMax 88 oz PDIR Culpepper, UG

  14. Culpepper, UG Prowl H20 1.75 pt + Reflex 1 pt PRE WeatherMax 22 oz + Dual Mag 18 DAP before Pigweed emergence WeatherMax 22 oz + Direx 1.5 pt PDIR

  15. Distribution of Glyphosate-Resistant Palmer Amaranth Culpepper, UG

  16. Herbicide Cost Needed To Manage Palmer Amaranth in Georgia and North Carolina Sensitive Palmer $18 $8 $10 Resistant Palmer $42 $24 $14 Cotton Soybean Corn Culpepper, UG

  17. “Giant” Ragweed Johnson, PU

  18. Sensitive Henry co. Suspect Noble co. 2.25 lb ae/A at 21 DAT Untreated Untreated Johnson, PU

  19. To which herbicide has waterhemp NOT developed resistance? • Blazer • Pursuit • Glyphosate • Reflex • Classic

  20. Resistance trait will move through pollen Culpepper, UG

  21. Critical factors affecting the development of herbicide resistance • Mutation rate for resistance traits • Initial frequency of resistant weeds • Herbicide selection intensity • Inheritance of resistance traits • Gene flow

  22. Soybean Adoption of Roundup Ready Technology in the US (million acres) 94% 96 97 98 99 00 01 02 03 04 05 06 Cotton Corn 43% 67% 98 99 00 01 02 03 04 05 06 97 98 99 00 01 02 03 04 05 06

  23. Adoption of Next Crops • Roundup Ready alfalfa? • Roundup Ready sugar beets?

  24. Reduce Selection Pressure • Diversify herbicide use • Ideally, use more than one herbicide mode of action on all weeds every year • Rotate glyphosate with other herbicides • Use preemergence herbicides in sequential programs • Apply glyphosate in combination with other POST herbicides • Use cultivation

  25. Resources Available

  26. Resources Available Glyphosate, Weeds, and Crops (GWC) Series http://www.glyphosateweedscrops.org/

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