Japanese Stiltgrass


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Presentation on the invasive Japanese stiltgrass.

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Japanese Stiltgrass

  1. 1. Japanese StiltgrassMicrostegium vimineum Chris Evans River to River CWMA www.rtrcwma.org/stiltgrass
  2. 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. 3. Identification• Weak rooted annual – Pulls up easily• 1-6 feet in height• Sprawling, weak stems• Longer stems prostrate along ground or propped-up
  4. 4. Identification• Turns purple-brown in fall, starting at the top of the plant (hence the name ‘Browntop’)
  5. 5. Identification Leaves • Short, wide leaves – 2-4 inches long – ½ - ¾ inch wide • Whitish midrib • Smooth edges (not serrated)
  6. 6. Identification
  7. 7. IdentificationFlowers/seeds• Thin spike-like raceme• 1,2 or 3-branched on long, wiry stem
  8. 8. 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
  9. 9. Ecology• Invade forests, forest edges, roadsides, ditches, etc.• Has the ability to dominate forest understory plants• Spring fires seem to promote stiltgrass
  10. 10. Impacts• Decreases habitat/forage• Decreases diversity in forest understory• Restricts some tree seedling establishment• Increases fuel loading
  11. 11. Timing• Late spring – seeds germinate• Summer – peak growth• Late summer / early fall – flowering• Early fall – seed set• Mid-late fall – senescence
  12. 12. Japanese Stiltgrass
  13. 13. Spread• Still actively expanding its range – Water – Gravity – Animals – Humans • Equipment • Roads • Shoes • Materials
  14. 14. Spread• Stiltgrass closely follows disturbance – Logging roads – Fire breaks – Trail construction – Logging – Other invasive control
  16. 16. Management and Control• Easy to kill, hard to eradicate• Pulls easily• Variety of herbicides work• Mowing before flower initiation• Fall burns?
  17. 17. 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
  18. 18. Chemical Control• Sethoxydim – 1-1.5%• Fluazifop – 0.5%• Clethodim – 0.33-0.66%• Glyphosate – 1-2%
  19. 19. 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
  20. 20. 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
  21. 21. 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
  22. 22. 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