2003 Roadside Vegetation Management Seminar

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2003 Roadside Vegetation Management Seminar

• When is it an Aquatic Application?

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The Letter

• Waters of this Commonwealth
• Rivers, streams, creeks, rivulets, impoundments,
  ditches, watercourses, storm sewers, lakes,
  dammed water, wetlands, ponds, springs and other
  bodies or channels of conveyance of surface and
  underground water, or parts thereof, whether
  natural or artificial, within or on the
  boundaries of this Commonwealth.
• 25 PA Code 102.1

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The Spirit

• When water bodies are very small (puddle) and
  isolated, a permit may not be required
• Is the water body an ecosystem?
• Is it continuous with an ecosystem?

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Guidelines for Wetland Settings

• EPA registered aquatic herbicides should be used
  around water, using 35 ft as a recommended buffer
• Exceptions to the buffer recommendation would be
  precisely applied treatments, such as cut surface
  treatments.
• Low volume foliar

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Permit Required

• Open water
• Bank treatment where overspray may contact water
• Treatment of wetlands with standing water beyond
  isolated puddles
• Treatment of wetlands with saturated soils

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Permit Not Required

• If water WILL NOT be treated and soil IS NOT
  saturated
• Wetlands with only isolated puddles and without
  saturated soil
• Rip-rap treatment if no overspray will occur
• Riparian areas, back from stream, if no overspray
  will occur

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PENNDOT Treatment Scenarios

• Broadcast applications to/over ditches - if not
  dry, permit required or treatment delayed.
• Wetlands becoming infested with purple
  loosestrife and potentially other species

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Wetland Scenarios

• Seasonally dry
• Intermittent flooding/saturation
• Inundated/saturated

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Aquatic Herbicides

• endothall
• 2,4-D
• fluridone
• diquat
• glyphosate
• triclopyr

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Selectivity

• Glyphosate
• Non-selective
• Active on loosestrife, phragmites and non-target
  species
• Triclopyr
• Selective
• Will leave grasses, sedges, rushes

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Glyphosate-aquatic

• IPA salt
• GlyPro (Rodeo)
• surfactant free
• 4 lb ae/gal (5.4 lb ai/gal)
• Glyphomate 41
• surfactant-loaded
• 3 lb ae/gal (4 lb ai/gal)

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Triclopyr-aquatic

• Garlon 3A
• Aquatic uses in production forests or industrial
  non-crop sites only
• Includes ROW
• Renovate
• Identical formulation to Garlon 3A
• Labeled for other non-crop sites

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Triclopyr in PENNDOT Wetlands

• Is the wetland a ROW?

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Research

• Compare triclopyr and glyphosate for control of
  loosestrife
• Rate
• Spot vs. Broadcast
• Timing