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  • Why Herbicide Applications Sometimes Fail

  • Did it reeeaaally fail? *Post Treatment monitoring *Treatment Return Interval

    “Know Thy enemy, and know thyselff….

  • Did it reeeaaally fail?

  • Applicator Error? • Did you get good coverage of target plants? • Effective use of adjuvants?

  • Superhydrophobicity?

    Presenter Presentation Notes You’ve read the label, using proper rates

  • Water Source issues

    • Surface water-suspended solids glyphosate, 2,4,D

    • Hard water- At 700mg/L TDS or higher Glyphosate –Use max rates & spray

    immediately after mixing

  • Rain

    Common Herbicides Hours till rainfast

    Diquat ½

    2,4-D amine 6-8

    Roundup(4lbs/g glyphosate) 1-2

    Habitat(2lbs/g Imazapyr) 1

    Escort XP(metsulfuron methyl) 4

    Milestone(aminopyrallid) 2

    Garlon 3A (triclopyr amine) 2

  • Herbicide Tolerance or Resistance? • Herbicide resistance: “Herbicide resistance is the inherited

    ability of a plant to survive and reproduce following exposure to a dose of herbicide normally lethal to the wild type.

    • Herbicide tolerance: “Herbicide tolerance is the inherent ability of a species to survive and reproduce after herbicide treatment.

    Presenter Presentation Notes Weed Science Society of America

  • • Glyphosate tolerance

    Tropical Soda Apple(Solanum viarum)

    • Triclopyr tolerance

    Chinaberry tree (Melia azedarach)

    lead tree (Leucaena leucocephala)

    Downy Rose Myrtle(Rhodomyrtus tomentosa)

  • Why Herbicide Applications Sometimes Fail Did it reeeaaally fail? Did it reeeaaally fail? Applicator Error? Superhydrophobicity? Water Source issues Rain Herbicide Tolerance or Resistance? Slide Number 9 Slide Number 10

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