SPRAY NOTIFICATION: Garden Loosestrife, Initial Treatments July 26 through August 9

July 26th, 2013 by UWBG Horticulturist

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UW Botanic Gardens has commenced its 5th and final year of the 5yr Dept. of Ecology, Garden Loostrife eradication project.

Our contractor, NW Aquatic Eco-Systems, has scheduled initial  spray applications to commence on July 26 and continue through first week of August.  There will be a final follow-up application in September.

Postings of project and current spray schedules include:

  • Waterfront Activity Center
  • UBNA kiosk
  • Slough bridge sign in E5 parking lot
  • Yesler Swamp Kiosk
  • UBNA loop trail, east-end
  • All Arboretum boat landings
  • Arboretum Waterfront Trail Entrances (Foster Island and old MOHAI )
  • D.O.T. park-n-ride lot off of 520 Lake WA Blvd exit ramp

Lysimachia vulgaris, Garden Loosestrife, a non-native wetland species is invasive in this area. State listed as a class B noxious weed, it requires control by the land manager UW Botanic Gardens as mandated by King County Noxious Weed Control Board.

Treatment includes:

  •  Approximately 5 miles of shoreline property bordering Union Bay including Foster and Marsh Islands in the Washington Park Arboretum
  • An initial and follow up spray application to occur between July 15 and October 1
  •  Both shoreline and land side application of the herbicide Habitat (imazapyr), a selective broadleaf herbicide.
    •  Non toxic to fish and their food web.
    •  No significant risk to birds or mammals

For more information about this project, please call 206-897-1642 or 206-543-8800.

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