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The New Tools for Aquatic Plant Management. Gary J. Burtle Animal & Dairy Science The University of Georgia – Tifton Campus. Control of Aquatic Plants. Copper – algae Diquat – contact herbicide Glyphosate (Rodeo) – grasses, shorline Endothal – contact herbicide

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the new tools for aquatic plant management

The New Tools for Aquatic Plant Management

Gary J. Burtle

Animal & Dairy Science

The University of Georgia – Tifton Campus

control of aquatic plants
Control of Aquatic Plants
  • Copper – algae
  • Diquat – contact herbicide
  • Glyphosate (Rodeo) – grasses, shorline
  • Endothal – contact herbicide
  • Floridone (Sonar) – residual herbicide
  • 2,4-D – growth regulator
  • Triclopyr – brush
  • Imazapyr – floating, emergent weeds
  • Carfentrazone – floating weeds
  • Dichlobenil – pre-emergent, not for food fish
  • Aquashade - dye
controlling invasive plants
Controlling Invasive Plants
  • Label extensions to aquatic plants prompted quicker approval of proven chemicals
  • Triclopyr
  • Imazapyr
  • Carfentrazone
trichlopyr
Trichlopyr
  • Systemic
  • Used primarily for weeds and brush along the pond edge
  • Production forests and industrial non- crop areas
  • Avoid overspray of pond water if possible
  • Renovate 3, Garlon 3A, Garlon 4, and Pathfinder II are some of the products
triclopyr mode of action
Triclopyr Mode of Action
  • Synthetic auxin – carboxilic acid
  • Causes rapid growth
  • Half life is less than one day in water
  • 0.5 gal/are or 1.5 to 6 lb/acre
best to control these plants
Best to control these plants
  • Emergent or ditchbank plants
  • Water lily
  • Water shield
  • Purple loostrife
  • Woody plants (willow)
precautions for triclopyr
Precautions for Triclopyr
  • No irrigation for 120 days
  • Hold dairy out till next growing season
  • No fish consumption or swimming restrictions
imazapyr
Imazapyr
  • Systemic
  • Broad leaf and brush
  • Floating leaf aquatic weeds
  • Not in irrigation ponds
  • Habitat, Arsenal (shoreline only)
imazapyr mode of action
Imazapyr Mode of Action
  • Interferes with amino acid metabolism
  • Gradually starves the plant
  • Active in small quantities
    • 1-2 pints per acre foot or surface acre
    • Applied in 100 gallons per acre = 0.125% solution
  • Takes several weeks to act
best to control these plants10
Best to control these plants
  • Floating weeds
  • Ditchbank and emergent weeds
  • Spartina (smooth cordgrass)
  • Parrotfeather
precautions when using imazapyr
Precautions when using Imazapyr
  • Irrigation restricted for 120 days
  • No restrictions on swimming, fish consumption, or animal watering
carfentrazone
Carfentrazone
  • Systemic
  • 40 to 60 g of product/ ha (0.56 oz/A)
  • Half life of 6 to 9 hours in water
  • Rainbow trout toxicity – ~1.1 ppm
  • Bluegill toxicity = ~1.5 ppm
  • Mysid shrimp toxicity = ~1.17 ppm
  • Has algicidal activity
  • Knockdown in 1 to 4 days
carfentrazone mode of action
Carfentrazone mode of action
  • Aryl triazolinone
  • Membrane disruption by inhibition of protoporpphyrinogen oxidase
  • Apply to small, active growing weeds
  • Contact must be achieved for effectiveness
best to control these plants15
Best to control these plants
  • Duckweed and watermeal
  • Water lettuce
  • Water hyacinth
precautions for carfentrazone
Precautions for Carfentrazone
  • Not approved for aerial application
  • Surfactants make non-target plant damage more likely
  • Restrict irrigation for 1-14 days depending on crop
  • Restrict animal watering for 1 day
  • No swimming or fishing restriction