Harbinger of Spring in Seattle – Flowering cherries on Azalea Way!

March 20th, 2014 by UWBG Horticulturist

Cherry photoMost visitors experiencing the beauty of our historic Azalea Way flowering cherries from now through May probably have no idea of how intensive maintaining their health and prolonging their longevity truly is for the UW Botanic Gardens horticulture staff.   Just ask our Integrated Pest manager, Ryan Garrison. Ryan with staff support spends many a day throughout the year monitoring and controlling the numerous diseases and insect pests our 175 plus cherries are prone to suffer from. Our rainy climate doesn’t help one bit either, especially when dealing with our most notable disease during blossom time;  a fungus known as Cherry Blossom Brown Rot. Yucko!  The good news is any new cherries we plant need to show a reasonable level of resistance. The not so good news is many of our older earlier bloomers, the ones extremely susceptible to the brown rot fungus,  need to be protected with fungicide applications during their bloom period.  As with all of our pest issues, we start with cultural and mechanical control efforts before resorting to chemical controls. The following Integrated Pest management (IPM) program discusses our best management practices for the control of blossom brown rot.  If you are interested in planting cherries for your home garden, I’ve included a list of cherries recommended for our PNW climate.  All have good to excellent resistance to blossom brown rot.

14 new cherries will be planted along Azalea Way, Spring of 2014! Thanks to the UW being awarded funds from the Nationwide Cherry Blossom Tree Planting Initiative grant co-sponsored by the Consulate-General of Japan in Seattle and other supporting local community organizations.

Cherry Blossom Brown Rot - causal fungal agent known as Monolinia fructicola. The fungus overwinters on infected twigs and dried fruit on the tree or ground.  The fungal spores are spread in the spring by wind and rain through the blossoms, causing twig dieback.  As part of the UWBG IPM program, moving toward our goal of eliminating the use of all synthetic pesticides is our ultimate goal.

IPM relies on many strategies to manage plant health care. 

  • Proper ID of the pest and its life cycle
  • Regular monitoring of the plants
  • The use of physical, mechanical, cultural, and biological controls
  • Chemical controls used as a last resort*
  • Least toxic chemicals used

* All spray applications are in compliance with WSDA pesticide regulations.  Sign postings are located at all entrances and Graham Visitor Center. Spray applications are scheduled based on timing and weather. We do our best to apply when public are not present. For more information, pls contact, David Zuckerman at 206-543-8008 or dzman@uw.edu

The cherries are pruned in early fall  to remove infected twigs and improve air circulation.  Tree rings are given a fresh coat of mulch in the fall to bury any infected plant material that may be on the ground.  In our Cherry Replacement program we are only using cultivars that are resistant to Blossom Brown Rot.

Cherries recommended for the PNW:

    • Prunus‘Berry Cascade Snow’
    • Prunus ‘Kwanzan’ syn. ‘Sekiyama’
    • Prunus‘Pink Flair®’
    • Prunus‘Royal Burgundy’
    • Prunus‘Shirofugen’
    • Prunus‘Shirotae’
    • Prunus‘Snow Goose’
    • Prunus subhirtella var. ascendens
    • Prunus x yedoensis ‘Shidare Yoshino’
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SPRAY NOTIFICATION: Garden Loosestrife, Initial Treatments July 26 through August 9

July 26th, 2013 by UWBG Horticulturist

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

August 4th, 2011 by UWBG Horticulturist

UW Botanic Gardens has begun 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.  Postings of project and current spray dates are located at all public accessible waterfront locations.  There will be a final follow-up application in September.

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

                                  

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Cherry Blossom Season is Here!

March 25th, 2011 by UWBG Horticulturist

Most visitors experiencing the beauty of our historic Azalea Way flowering cherries from now through May probably have no idea of how intensive maintaining their health and prolonging their longevity truly is for the UW Botanic Gardens horticulture staff.   Just ask our Integrated Pest manager, Ryan Garrison. Ryan with staff support spends many a day throughout the year monitoring and controlling the numerous diseases and insect pests our 175 plus cherries are prone to suffer from. Our rainy climate doesn’t help one bit either, especially when dealing with our most notable disease during blossom time;  a fungus known as Cherry Blossom Brown Rot. Yucko!  The good news is any new cherries we plant need to show a reasonable level of resistance. The not so good news is many of our older earlier bloomers, the ones extremely susceptible to the brown rot fungus,  need to be protected with fungicide applications during their bloom period.  As with all of our pest issues, we start with cultural and mechanical control efforts before resorting to chemical controls. The following Integrated Pest management (IPM) program discusses our best management practices for the control of blossom brown rot.  If you are interested in planting cherries for your home garden, I’ve included a list of cherries recommended for our PNW climate, all have good to excellent resistance to blossom brown rot.

Cherry Blossom Brown Rot - causal fungal agent known as Monolinia fructicola. The fungus overwinters on infected twigs and dried fruit on the tree or ground.  The fungal spores are spread in the spring by wind and rain through the blossoms, causing twig dieback.  As part of the UWBG IPM program, moving toward our goal of eliminating the use of all synthetic pesticides is our ultimate goal.

IPM relies on many strategies to manage plant health care. 

  • Proper ID of the pest and its life cycle
  • Regular monitoring of the plants
  • The use of physical, mechanical, cultural, and biological controls
  • Chemical controls used as a last resort*
  • Least toxic chemicals used

* All spray applications are in compliance with WSDA pesticide regulations.  Sign postings are located at all entrances and Graham Visitor Center. Spray applications are scheduled based on timing and weather. We do our best to apply when public are not present. For more information, pls contact, David Zuckerman at 206-543-8008 or dzman@uw.edu

The cherries are pruned in early fall  to remove infected twigs and improve air circulation.  Tree rings are given a fresh coat of mulch in the fall to bury any infected plant material that may be on the ground.  In our Cherry Replacement program we are only using cultivars that are resistant to Blossom Brown Rot.

Cherries recommended for the PNW:

    • Prunus ‘Berry Cascade Snow’
    • Prunus ‘Kwanzan’ syn. ‘Sekiyama’
    • Prunus ‘Pink Flair®’
    • Prunus ‘Royal Burgundy’
    • Prunus ‘Shirofugen’
    • Prunus ‘Shirotae’
    • Prunus ‘Snow Goose’
    • Prunus subhirtella var. ascendens
    • Prunus x yedoensis ‘Shidare Yoshino’

 

 

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Garden Loosestrife – Spray Application Scheduled 9/22

September 14th, 2010 by UWBG Horticulturist

UWBG IPM staff will be out on Union Bay, Wednesday, September 22nd, w/ spray contractor NW Aquatic Eco-Systems. All canoe landings and shoreline trailheads will be posted. This is the second of  two  follow-up spray applications in our effort to control the class A noxious weed, Garden Loosestrife.

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Garden Loosestrife Spray Scheduled – Wed., August 18, 2010

August 13th, 2010 by UWBG Horticulturist

Garden Loosestrife (GL) control contractor, NW Aquatic Ecosystems, along with UW Botanic Garden IPM staff, will complete initial 2010 treatment on Wednesday, August 18th. The  Waterfront Trail between Foster Island and MOHAI will be closed early am to public temporarily for contractor access to GL growing near the trail. Signs will be posted on barricades at both trailhead entrances and also staffed during spray period to avoid public breaching the barricades. Trail will be reopened once material has dried on foliage. The remainder applications will be accomplished via boat in and around Marsh and other islands and inlets throughout UW Botanic Gardens managed Union Bay shorelines.

Scheduled pm Kayak tours will not be disrupted. Applications within tour boundaries will be completed in am.

There will be a follow-up treatment later in September. Notice will go out as soon as date is set.

For further information, call 206-543-8800

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