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Lonicera japonica - allelopathic effects on pine regeneration

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  • Marc Imlay
    Hi, In reference to Jil s note: In case you d given up on trying to manage Japanese honeysuckle, here s some information that may rekindle your interest in
    Message 1 of 2 , Mar 8, 2005
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      In reference to Jil's note: "In case you'd given up on trying to
      manage Japanese honeysuckle, here's some information that
      may rekindle your interest in targeting this plant." I would like
      to share our experiences.

      We pull out Japanese honeysuckle by the roots in Winter in the
      forested areas wherever we see it up in the trees, aim the roots
      upward and tie them in place. The absence of light energy causes
      the trailing vines to decline precipitously the next year. Thus
      we control 80% of the honeysuckle with 10% of the effort to
      control all of it and minimal soil disturbance.

      Do not pull it out of the trees and watch for native vines
      (moonseed, trumpet vine, native grape etc.). This method
      greatly reduces spraying requirements.

      Removing the horizontal component may require the use of
      herbicide in Winter or late Fall to avoid natives.

      The status at the 200 acre Swann Park is 80 percent cleared totally
      and 95% cleared of the vertical component. The status at Chapman
      Forest is 500 acres cleared of the vertical component.

      None have come back up the trees even 5 years after removal.

      Marc Imlay, PhD

      Chair of the Biodiversity and Habitat Stewardship Committee
      for the Maryland Chapter of the Sierra Club.
      Board member of the Mid-Atlantic Exotic Pest Plant Council,
      Hui o Laka at Kokee State Park, Hawaii
      Vice president of the Maryland Native Plant Society,
      Conservation biologist, Anacostia Watershed
      Society (301-699-6204, 301-283-0808)

      Invasive Species and
      Pest Management Coordinator

      National Capital Region
      Center for Urban Ecology
      4598 MacArthur Blvd., NW
      Washington DC 20007
      Phone/ 202-342-1443, ex. 218
      Fax/ 202-282-1031

      The attached article was sent to me by Dan Kjar, the G'tn. grad. student
      who is putting together the invertebrte database for the region. It's a
      little scary to think that the leaf litter of Japanese honeysuckle may be
      allelopathic. The research only tested it on pines, but...
      (See attached file: skulman2004.pdf)

      Sue Salmons
      Resource Management Specialist - Vegetation
      Rock Creek Park
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