Tilling Himalayan Blackberry out of Yosemite Valley · Tilling Him a laya n Blackberry Out of...
Transcript of Tilling Himalayan Blackberry out of Yosemite Valley · Tilling Him a laya n Blackberry Out of...
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Tilling Himalayan Blackberry Out of Yosemite Valley
©2003 Penn Martin II
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©2002 George Hartwell
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Michael May -SFEI
kaweahoaks.com
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Taxonomy of Himalayan Blackberry: a very confusing topic
• Rubus discolor Weihe & Neesis the most commonly used name for Himalayan blackberry.
• Synonyms:Rubus procerus auct. non P.J. Muell. ExGenevRubus fruticosus L.Rubus macrostemon (Focke)SampaioRubus thyrsanthus (Focke)FoersteRubus praecox Bertol.Rubus grabowskii WeiheexGuntheret al.
• “Rubus armeniacus-A Correct Name for Himalayan Blackberry” by Dr.Adolf Ceska
www.ou.edu/cas/botany-micro/ben/ben230.html
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Luther Burbank
1849-1926
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W hy did it escape cultivation so quickly?
•Produces 7,000 to 13,000 seeds per square meter if growing in ample sunlight
•Can form roots at cane tips that touch the ground
•Canes can grow to 7 meters (23 feet) in a single year
•Forms long lateral roots from root crown
•Roots can grow to 90 centimeters (3 feet) deep
•Easily propagates from root and cane pieces
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USDA Plants website
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Calflora website
Distribution based on vouchers, observations, and literature
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Himalayan Blackberry in Yosemite Valley
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What impacts does it have on natural resources?
•It displaces native plants in valuable wetland, riparian, and meadow habitats by quickly smothering plants and blocking out light.
•It is a fire hazard around structures
• Limits access to watercourses
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Hand-digging Treatment
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Herbicide Treatment
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Brush Mowing Treatment
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Tilling Treatment
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Scarifier
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Project Goals
• To develop a feasible method to eradicate large infestations of Himalayan blackberry in developed and/or heavily disturbed areas in Yosemite Valley
• To begin to develop a strategy for invasive plant removal in the flooded the campgrounds in eastern Yosemite Valley, which are planned for restoration to natural conditions in the Yosemite Valley Plan (2001)
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Control site
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October 24, 2001
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June 2002
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October 2002
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September 2003
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October 2002
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Control site
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Lisa Ordonez, Park Botanist
Vegetation and Ecological Restoration
Resources Management
Yosemite National Park
209-379-1217
“Invasive species are now widely “Invasive species are now widely recognized worldwide as posing recognized worldwide as posing threats to biological diversity second threats to biological diversity second only to direct habitat loss and only to direct habitat loss and fragmentation.”fragmentation.”
John M. Randall and Marc C.John M. Randall and Marc C. HoshovskyHoshovsky