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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?
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
Common Herbicides Hours till rainfast
2,4-D amine 6-8
Roundup(4lbs/g glyphosate) 1-2
Habitat(2lbs/g Imazapyr) 1
Escort XP(metsulfuron methyl) 4
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