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Japanese Stiltgrass
Microstegium vimineum
        Chris Evans
   River to River CWMA
 www.rtrcwma.org/stiltgrass
Japanese Stiltgrass
• Nepalese Browntop, Eualia, Chinese Packing
  Grass
• Annual, warm season, shade tolerant grass
• Native to Asia
• First found in the United States in 1919 in
  Knoxville, Tennessee
Identification
• Weak rooted annual
  – Pulls up easily
• 1-6 feet in height
• Sprawling, weak stems
• Longer stems prostrate along ground or
  propped-up
Identification
• Turns purple-brown in fall, starting at the top
  of the plant (hence the name ‘Browntop’)
Identification

   Leaves
   • Short, wide leaves
     – 2-4 inches long
     – ½ - ¾ inch wide
   • Whitish midrib
   • Smooth edges (not
     serrated)
Identification
Identification
Flowers/seeds
• Thin spike-like raceme
• 1,2 or 3-branched on long,
  wiry stem
Ecology
• Grows in a variety of habitats
  – Deep shade to full sun
  – Moist soils to dry conditions
• Does best in semi-shaded environment with
  adequate soil moisture
• Seeds can be viable for a long period (7-10
  years), but most germinate in first two years
  – Differs by seed type and local conditions
Ecology
• Invade forests, forest edges, roadsides,
  ditches, etc.
• Has the ability to dominate forest understory
  plants
• Spring fires seem to
  promote stiltgrass
Impacts
• Decreases habitat/forage
• Decreases diversity in forest
  understory
• Restricts some tree seedling
  establishment
• Increases fuel loading
Timing
•   Late spring – seeds germinate
•   Summer – peak growth
•   Late summer / early fall – flowering
•   Early fall – seed set
•   Mid-late fall – senescence
Japanese Stiltgrass
Spread
• Still actively expanding its range
  – Water
  – Gravity
  – Animals
  – Humans
     •   Equipment
     •   Roads
     •   Shoes
     •   Materials
Spread
• Stiltgrass closely follows disturbance
  – Logging roads
  – Fire breaks
  – Trail construction
  – Logging
  – Other invasive control
MANAGEMENT AND CONTROL
Management and Control
•   Easy to kill, hard to eradicate
•   Pulls easily
•   Variety of herbicides work
•   Mowing before flower initiation
•   Fall burns?
Chemical Control
• Broad-spectrum, grass-specific, and pre-
  emergent herbicides will kill stiltgrass
  – Some recent research indicating that native
    recovery may be best when using grass-specific
    herbicides
• Wetlands and streamsides limit what type of
  chemicals you can use
  – Aquatic-label glyphosate
Chemical Control
• Sethoxydim
  – 1-1.5%
• Fluazifop
  – 0.5%
• Clethodim
  – 0.33-0.66%
• Glyphosate
  – 1-2%
Mechanical Control
• Post-treatment equipment sanitation is a
  MUST
• If flowers are present, then plant material
  should be bagged and removed
• Late summer (but before flower initiation)
  mowing may prevent seed set
Management and Control
• Key is to conduct control efforts before flower
  initiation or seed set
   – Being an annual, your goal is not to kill the plant, it is to
     prevent seed production
   – Germination may continue after early-season control
     activities
• Think about landscape level infestations
• May be a waste of money to control stiltgrass in one
  area if infestations occur farther upstream in the
  watershed
Prevention
• Early Detection / Rapid Response
• Equipment sanitation
• Infestation avoidance
  – Re-routing firebreaks
  – Pre-logging treatments
• Changes in firelines
  – Green lines
  – Blown instead of plowed lines
• Coordinate efforts regionally
Summary
• Stiltgrass is a major invader of forestlands with
  drastic impacts
• Stiltgrass has rapid spread and can be introduced
  through human activities
• Several different chemical treatments are effective at
  controlling stiltgrass, but grass-specific herbicides
  tend to allow recovery of native plants the best
• Coordination across ownership boundaries is
  necessary to achieve success in management

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Japanese Stiltgrass

  • 1. Japanese Stiltgrass Microstegium vimineum Chris Evans River to River CWMA www.rtrcwma.org/stiltgrass
  • 2. Japanese Stiltgrass • Nepalese Browntop, Eualia, Chinese Packing Grass • Annual, warm season, shade tolerant grass • Native to Asia • First found in the United States in 1919 in Knoxville, Tennessee
  • 3.
  • 4. Identification • Weak rooted annual – Pulls up easily • 1-6 feet in height • Sprawling, weak stems • Longer stems prostrate along ground or propped-up
  • 5.
  • 6.
  • 7. Identification • Turns purple-brown in fall, starting at the top of the plant (hence the name ‘Browntop’)
  • 8. Identification Leaves • Short, wide leaves – 2-4 inches long – ½ - ¾ inch wide • Whitish midrib • Smooth edges (not serrated)
  • 10. Identification Flowers/seeds • Thin spike-like raceme • 1,2 or 3-branched on long, wiry stem
  • 11. Ecology • Grows in a variety of habitats – Deep shade to full sun – Moist soils to dry conditions • Does best in semi-shaded environment with adequate soil moisture • Seeds can be viable for a long period (7-10 years), but most germinate in first two years – Differs by seed type and local conditions
  • 12. Ecology • Invade forests, forest edges, roadsides, ditches, etc. • Has the ability to dominate forest understory plants • Spring fires seem to promote stiltgrass
  • 13. Impacts • Decreases habitat/forage • Decreases diversity in forest understory • Restricts some tree seedling establishment • Increases fuel loading
  • 14. Timing • Late spring – seeds germinate • Summer – peak growth • Late summer / early fall – flowering • Early fall – seed set • Mid-late fall – senescence
  • 15.
  • 17.
  • 18.
  • 19.
  • 20. Spread • Still actively expanding its range – Water – Gravity – Animals – Humans • Equipment • Roads • Shoes • Materials
  • 21.
  • 22.
  • 23. Spread • Stiltgrass closely follows disturbance – Logging roads – Fire breaks – Trail construction – Logging – Other invasive control
  • 25. Management and Control • Easy to kill, hard to eradicate • Pulls easily • Variety of herbicides work • Mowing before flower initiation • Fall burns?
  • 26. Chemical Control • Broad-spectrum, grass-specific, and pre- emergent herbicides will kill stiltgrass – Some recent research indicating that native recovery may be best when using grass-specific herbicides • Wetlands and streamsides limit what type of chemicals you can use – Aquatic-label glyphosate
  • 27. Chemical Control • Sethoxydim – 1-1.5% • Fluazifop – 0.5% • Clethodim – 0.33-0.66% • Glyphosate – 1-2%
  • 28. Mechanical Control • Post-treatment equipment sanitation is a MUST • If flowers are present, then plant material should be bagged and removed • Late summer (but before flower initiation) mowing may prevent seed set
  • 29. Management and Control • Key is to conduct control efforts before flower initiation or seed set – Being an annual, your goal is not to kill the plant, it is to prevent seed production – Germination may continue after early-season control activities • Think about landscape level infestations • May be a waste of money to control stiltgrass in one area if infestations occur farther upstream in the watershed
  • 30. Prevention • Early Detection / Rapid Response • Equipment sanitation • Infestation avoidance – Re-routing firebreaks – Pre-logging treatments • Changes in firelines – Green lines – Blown instead of plowed lines • Coordinate efforts regionally
  • 31. Summary • Stiltgrass is a major invader of forestlands with drastic impacts • Stiltgrass has rapid spread and can be introduced through human activities • Several different chemical treatments are effective at controlling stiltgrass, but grass-specific herbicides tend to allow recovery of native plants the best • Coordination across ownership boundaries is necessary to achieve success in management