Why Herbicide Applications Sometimes Fail
Did it reeeaaally fail?*Post Treatment monitoring*Treatment Return Interval
“Know Thy enemy, andknow thyselff….
Did it reeeaaally fail?
Applicator Error?• Did you get good coverage of target plants?• Effective use of adjuvants?
Superhydrophobicity?
Water Source issues
• Surface water-suspended solidsglyphosate, 2,4,D
• Hard water- At 700mg/L TDS or higherGlyphosate –Use max rates & spray
immediately after mixing
Rain
Common HerbicidesHours 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.
• Glyphosate tolerance
Tropical Soda Apple(Solanum viarum)
• Triclopyr tolerance
Chinaberry tree (Melia azedarach)
lead tree (Leucaena leucocephala)
Downy Rose Myrtle(Rhodomyrtus tomentosa)
