Mg Invasive Spp. Minicollege 8.6.09

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PowerPoint presentation to Oregon Master Gardeners at the OSU Master Gardener Minicollege, 2009, Corvallis, OR. This is not for distribution or reproduction.

PowerPoint presentation to Oregon Master Gardeners at the OSU Master Gardener Minicollege, 2009, Corvallis, OR. This is not for distribution or reproduction.

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  • 1. Invasive Species 101:
    A primer for Master Gardeners
    Robert Emanuel
    Water Resources and Community Development Faculty,
    Tillamook and Clatsop counties
  • 2. Introduction
    What are invasive species?
    Why should we care?
    Biology & management
    Some PNWinvaders
    What can gardeners do about them?
    Resources for more information.
  • 3. Invasive species means an alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health.
  • 4.
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  • 7. Biological invaders destroy habitats or out-compete native plants and animals.
    Why should we care?
    Invasive species costs Americans about $143 billion/year!
    At least 30 new potential biological invaders enter the US every day…
  • 8.
  • 9. Understanding Biological Invasions
  • 10. Definitions: Invasive Plants
    A plant growing where you do not want it.
    Lots of beneficial species: Crops, pasture, forestry & ornamentals.
    A regulatory designation.
    Spreads outside of cultivation, and causes environmental& economic harm.
    Co-evolution with other species, our natural heritage
  • 11. What makes a plant invasive?
    Lack normal environmental constraints
    Fast growth and reproduction
    Highly adaptable a wide range of conditions
    Often can transform their environment
    Often encouraged by disturbance
    Dominance = less biodiversity
  • 12. Key Stages in Plant Invasions
    Lag Time
    Area Infested
  • 13. What does this mean for management?
    People notice them here
    Detection: focus resources here
    Prevention or Eradication(Inexpensive)
    Local control and management only
    Area Infested
    Control Costs
  • 14. How do we manage invasive plants?
    Quarantine before introduction
    Monitoring & mapping
    Chemical treatment (herbicides)
    Biological controls (biocontrol)
    Cultural treatment (hand pulling, cutting, etc.)
  • 15. Invasive Species of Horticultural Origin in Oregon
  • 16. Photo - knotweed
    Japanese Knotweed: Fallopiapolystachyum
  • 17. Glenn Miller, ODA
    Giant Knotweed: Polygonumsachalinese
  • 18. Photo - knotweed
    Knotweed: Fallopiax bohemicum
  • 19. Photo - English ivy
    English Ivy: Hedera helix
  • 20. Photos: Christine McDonald
    Policeman’s Helmet: Impatiens gladulifera
  • 21. R. Emanuel, OSU
    Parrot feather: Myriophyllumaquaticum
  • 22. Photo: Judy Scott, OSU
    Yellow Flag Iris: Iris pseudacorus
  • 23. Lynn Ketchum, OSU EESC
    Common Gorse: Ulexeuropaeus
  • 24. Photos: Michael L. Charters
    Spanish Broom: Spartiumjunceum
  • 25. Scotch Broom: Cytisusscoparius
  • 26. French Broom: Genistamonspessulana
  • 27. Photo: Paul Wray, Iowa State University
    Russian Olive: Elaeagnusangustifolia
  • 28. Photo: Wikimedia
    Photo: EikeWulfmeyer
    Old Man’s Beard, Travelers Joy: Clematis vitalba
  • 29. Old Man’s Beard: Clematis vitalba
  • 30. Spurge Laurel: Daphne laureola
  • 31. Photo – butterfly bush infestation in Lane Co.
    Butterfly Bush: Buddlejadavidii
  • 32. Purple Loosestrife: Lythrumsalicaria
  • 33. Tree of Heaven: Ailanthus altissima
    Photo: USFS
  • 34. Fennel: Foeniculumvulgare
  • 35. Photo: JohnathanJ. Stegeman
    Bachelor’s button: Centaureacyanus
  • 36. Desert Indigobush: Amorphafruticosa
  • 37. Myrtle spurge: Euphorbia myrsintes
  • 38. Leafy spurge: Euphorbia esula
  • 39. Lynn Ketchum, OSU EESC
    English Holly: Ilex aquilfolium
  • 40. But wait! There’s MORE!
  • 41. Salt Cedar: Tamarix spp.
  • 42. Photo: University of Georgia
  • 43. Photo: Kurt W. Heckeroth
    Petasites japonica var. giganteum
  • 44. Photos: WA State Weed Control Board
    Yellow Archangel: Lamiastrumgaleobdolon
  • 45. Photos: King County , WA
    Garden Loosestrife: Lysimarchiavulgaris
  • 46. Clary Sage: Salvia sclarea
  • 47. Photo: Robert Emanuel, OSU
    Fragrant Water Lilly: Nymphaeaodorata
  • 48. Only you can prevent the invasion!
  • 49. What can Master Gardeners do?
    Know thy enemy & teach others about them
    Grow native & non-invasive wherever possible
    Help others to do the same
    Help the public with information on treatment
    Monitor and report new invaders
    Check clothes, vehicles, pets when out & about
  • 50. What can Master Gardeners do?
    Don’t share unless you know it’s not invasive
    Stay away from generic wildflower mixtures
    Watch for hitchhikers in nursery stock
    Use weed-free soil and mulch
    Watch introductions for aggressive behavior
    Don’t dump your yard clippings in the wild!
  • 51. If you have a known invasive (but can’t part with it)
    Deadhead faithfully
    Use root barriers
    Dispose of plant material properly—bagged in the garbage or burned (completely)
    Please don’t share your invader with others!
    Contain it, control it, or cage it!
  • 52. For Water Gardeners
    Always wash new introductions (think snails)
    Keep water garden separate from native waters
    Never dump water garden materials or water into native waters
    Research your plants for invasive potential—many commonly used aquatics are!
  • 53. Some Resources
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  • 63. Invasive Spp. Web Resources
    Pacific Northwest Weed Management Handbook:
    Oregon Invasive Species
    National Invasive Species Clearinghouse:
    USDA PLANTS Database:
    WA State Noxious Weed Board:
    Idaho Weed
    California Invasive Plant
  • 64. Questions?
    Robert M. Emanuel
    Water Resources & Community Development
    Tillamook & Clatsop counties
    2204 Fourth Street
    Tillamook, OR 97141
    (503) 842-5708 X 2