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  • Managing Himalayan blackberry in western Oregon riparian areas

    Creator:
    Oregon State University. Extension Service and Bennett, Max, 1963-
    Abstract:
    Himalayan blackberry (Rubus armeniacus, formerly Rubus discolor and Rubus procerus) is a European shrub that was introduced in the United States as a crop in the late 19th century. It escaped cultivation and has since invaded a variety of sites, including low-elevation streamside areas throughout the Pacific Northwest. Listed as...
    Resource Type:
    Technical Report
    Full Text:
    the Pacific Northwest. Listed as a noxious weed in Oregon, Himalayan blackberry rap- idly occupies

  • Gorse, Ulex europaeus

    Creator:
    Oregon State University. Extension Service
    Abstract:
    Gorse is a spiny, evergreen shrub native to the Mediterranean region. It was introduced on the West Coast of the United States as an ornamental in the late 1800s. Gorse was first found in Oregon in Benton County in 1916. Gorse infestations are concentrated along the Oregon coast, particularly south...
    Resource Type:
    Technical Report
    Full Text:
    prevent developing herbicide-resistant strains of the weed. For details on chemical control, refer to

  • Knotweeds, Polygonum spp.

    Creator:
    Oregon State University. Extension Service
    Abstract:
    Japanese and giant knotweeds were introduced to North America in the late 1800s as ornamentals but soon escaped into the wild. They are particularly invasive along streams, roadsides, and waste areas. Large, spreading patches of knotweed can completely dominate and displace native species in open sunlight. Erosion can increase on...
    Resource Type:
    Technical Report
    Full Text:
    Oregon Department of Agriculture, Plant Division, Noxious Weed Control. http://oregon.gov/ODA/PLANT

  • Knapweeds, Centaurea spp., Acroptilon repens

    Creator:
    Oregon State University. Extension Service
    Abstract:
    Knapweeds are a serious problem in Oregon because they vigorously invade disturbed or degraded sites and form dense populations that exclude native and desirable plant communities, causing economic and ecological losses. Their ability to spread rapidly by seeds and roots makes control very difficult. Seeds can remain viable for 5...
    Resource Type:
    Technical Report
    Full Text:
    control. Several herbicides are effective against knapweeds, but successful weed treatment depends on

  • Slender false-brome, Brachypodium sylvaticum

    Creator:
    Oregon State University. Extension Service
    Abstract:
    Slender false-brome is a perennial grass species native to Europe, Asia, and North Africa. The species has exceptionally wide distribution, occupying forested and open areas at a variety of aspects and elevations. Populations are known in riparian forests as well as in upland hardwood and conifer forests under patchy and...
    Resource Type:
    Technical Report
    Full Text:
    -resistant strains of the weed. For details on chemical control, refer to the current edition of the PNW

  • Himalayan blackberry, Rubus armeniacus (discolor), Evergreen blackberry, Rubus lacinatus

    Creator:
    Oregon State University. Extension Service
    Abstract:
    Himalayan blackberry, also known as Armenian blackberry, is a widespread invasive species in western Oregon and also grows in some eastern Oregon riparian zones. Commonly found in riparian areas, it also grows along roadsides and fence corridors and in open woodlands, logged areas, and other disturbed sites. It grows best...
    Resource Type:
    Technical Report
    Full Text:
    information Oregon Department of Agriculture, Plant Division, Noxious Weed Control. http://oregon.gov/ODA

  • The effects of defoliation on yellow starthistle (Centaurea solstitialis L.) reproductive capacity

    Creator:
    Schumacher, Stacy
    Abstract:
    Yellow starthistle (Centaurea solstitialis L.) is an introduced Asteraceae that has become established on 10 million acres in the Pacific Northwest and California. This weed functions as an annual or short-lived perennial and depends on seeds for reproduction. Strategies of control that reduce plant fitness or lower seed production or...
    Resource Type:
    Masters Thesis
    Full Text:
    northeastern Oregon 47 14. Percent infestation of yellow starthistle seedheads of biological control agents

  • Yellow starthistle, Centaurea solstitalis

    Creator:
    Oregon State University. Extension Service
    Abstract:
    Yellow starthistle, a native of the Mediterranean region, arrived in this country in 1869 as a contaminant in alfalfa seed. It is a strong invader of disturbed areas, rangelands, and roadsides and thrives in areas of summer drought. A yellow starthistle invasion will reduce biodiversity by choking out native plants....
    Resource Type:
    Technical Report
    Full Text:
    production. For more information Oregon Department of Agriculture, Plant Division, Noxious Weed Control

  • Tansy ragwort, Senecio jacobaea [2008]

    Creator:
    Oregon State University. Extension Service
    Abstract:
    Published September 2008. Reviewed August 2014. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
    Resource Type:
    Technical Report
    Full Text:
    , Noxious Weed Control. http://oregon.gov/ODA/PLANT/WEEDS/ Weedmapper, a collaborative project of Oregon

  • English ivy, Hedera helix

    Creator:
    Oregon State University. Extension Service
    Abstract:
    English ivy is a trailing or climbing vine in the ginseng family, native to Europe and brought to America by early colonists. It is commonly cultivated as a groundcover and is widespread in the Pacific Northwest, where it has invaded many wild and unmanaged areas. It is an aggressive invader...
    Resource Type:
    Technical Report
    Full Text:
    Weed Control. http://oregon.gov/ODA/PLANT/WEEDS/ Weedmapper, a collaborative project of Oregon Depart