the production and invasion of buddleja davidii in oregon l.
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The Production and Invasion of Buddleja davidii in Oregon Julie Ream with Dr. James Altland Butterfly bush worldwide Grows on old industrial sites and bomb sites in England Problem on river bars, floodplains, and forest plantations in New Zealand

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Presentation Transcript
butterfly bush worldwide
Butterfly bush worldwide
  • Grows on old industrial sites and bomb sites in England
  • Problem on river bars, floodplains, and forest plantations in New Zealand
  • Thrives on interstate medians and rivers in Washington state
butterfly bush in oregon
Butterfly bush in Oregon
  • High value product in nursery, landscape, and retail garden industry
  • B-listed as a noxious weed
why butterfly bush was listed
Why butterfly bush was listed
  • Very invasive in certain riparian areas
  • Grows on many roads in Oregon
  • As big a problem as scotch broom for some foresters
  • Thrives where nothing else grows
my project goals
My project goals
  • To describe in detail the natural sites invaded by Buddleja davidii
  • To determine nursery production practices that could limit or eliminate invasiveness
natural sites materials and methods
Natural sites: materials and methods
  • Site selection:

-Planned to do 3-4 sites of each type (riparian, roadside, natural area, old industrial area) in each geographic region

-Geographic regions included Portland metro area, Coos Bay area, Oakridge area, and rural North Willamette Valley

natural sites materials and methods9
Natural sites: materials and methods
  • Marked out the area of each site using set guidelines
  • Established 5 subplots per site for certain data questions
  • Simply answered the other data questions
natural sites observations
Natural sites: observations
  • Grows everywhere from floodplains to mountain slopes
  • Appears to be a pioneering species
  • Densest invasions were on burn sites and regularly disturbed sites
  • Grows mostly in rocky and sandy soils, but found some in clay soils
  • Herbicides control it if applied by hand
nursery production materials and methods
Nursery production: materials and methods
  • Visited both retail (9) and production (10) nurseries
  • Asked about management practices
  • Looked for and collected escaped seedlings
nursery production observations
Nursery production: observations
  • Nurseries that did not cut back over winter had more escaped seedlings
  • Loose cuttings rooted themselves
  • Most nurseries with escapees were wholesale/production operations
nursery production results
Nursery production: results
  • Determined that 37% of nurseries I visited had escaped seedlings
  • Of those 37%, 71% were production nurseries
more to be done
More to be done
  • Visit more nurseries and more natural sites
  • Herbicide trials
  • Seed tests

-when seeds are released

-how far wind blows seeds from mother plant

-if seeds need heat to germinate

acknowledgements
HHMI Program

OAN and the Nursery Industry

Dr. Mark Wilson of Botany and Plant Pathology Dept.

Rod Jordan of Moore Mills Timber Co.

Jim Carr of Menasha Forest Products

Portland Parks and Recreation

Dr. James Altland of Horticulture Dept.

Steve Wickham of Plum Creek Forest Products

Wanda Crannell, BRR advisor

Tim Butler and Glenn Miller of the ODA

The Nature Conservancy

Bruce Kelpsas of Helena Chemical Company

Acknowledgements