Glyphosate Stewardship Should You Care?

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Glyphosate StewardshipShould You Care?

• Insert your name here
• UW Best County

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Susceptible Weed
Resistant Weed
(Adapted from Gunsolus 1993)
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Glyphosate Resistance

• Current Confirmed Species
• rigid ryegrass
• Italian ryegrass California, Oregon
• goosegrass
• horseweed 12 states TN - 1.5 million acres
• buckhorn plantain
• hairy fleabane
• common ragweed - Missouri
• common lambsquarters - Ohio

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21 horseweed populations prior to herbicide
application - Indiana
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21 horseweed populations 3 weeks after 2X
glyphosate
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Response of Glyphosate Resistant Horseweed to
Alternative Herbicides
Population Region FirstRate Classic Paraquat 2,4-D
56 SE S S R S
70 SE R S S S
73 SE R S S S
83 SE R R S S
173 SE R S S S
174 SE R S S S
260 SE R R S S
363 SE R S S R
392 NE S R S S
W. Johnson, Purdue, 2003
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Common Lambsquarters Control with Glyphosate
(Stachler and Loux, OSU)
Ross Co.
Sandusky Co.
Untreated
1X
4X
Untreated
1X
4X
Glyphosate 1X 0.75 lb ae/A
Glyphosate 1X 0.75 lb ae/A
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If we use the right rate Dead weeds will not
become resistant
Will a resistant weed be dead?
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Wisconsin Farmers and Agri-Business Call for
Glyphosate Stewardship

• Key Points
• Glyphosate and Roundup Ready Crops are valuable
  tools for Wisconsin farmers.
• The risk of glyphosate-resistant weeds will
  increase with improper use of glyphosate.
• Glyphosate-resistant weeds will reduce the value
  of this technology.
• New herbicides are not being developed to
  replace glyphosate.
• Wisconsin farmers should be proactive leaders
  and practice glyphosate stewardship.

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Glyphosate Stewardship Practices

• Rotate between Roundup Ready and conventional
  crops or crops with other types of herbicide
  resistance. Use Roundup Ready crops in your
  rotation where they have the greatest economic
  and management value.
• Rotate glyphosate with other herbicide modes of
  action. Rotate non-glyphosate herbicides over
  time as well.

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Glyphosate Stewardship Practices

• Apply glyphosate at labeled rates at the correct
  stage of growth.
• If glyphosate is used as a burndown treatment and
  in-crop, tank mix the glyphosate applied in the
  burndown treatment with another mode of action
  (such as 2,4-D).

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Glyphosate Stewardship Practices

• Use cultivation after in-crop applications of
  glyphosate when possible.
• Scout fields regularly and identify weeds
  present.
• Respond quickly to changes in weed population.

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