World's Worst Invasives


More than half a dozen of the 100 of the World's Worst Invasive Species are present in Nova Scotia.

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    Terrestrial Invasive Alien Species

    Currently, there is no single “go-to” list of terrestrial invasive alien species in Nova Scotia. ISANS is working with experts to develop lists of ecologically important invasive alien plants and insects. In the meantime, please click on a species to learn more about these known Nova Scotia invaders. Links lead to a variety of resources: some Nova Scotian, some Canadian, and some US. 

    Himalayan balsam (Impatiens glandulifera)

    Giant hogweed (Heracleum mantegazzianum) [1] [2] [3]

    Oriental bittersweet (Celastrus orbiculatus)

    Japanese knotweed (Fallopia japonica, Polygonum cuspidatum)

    Glossy buckthorn (Frangula alnus)

    Gypsy moth (Lymantria dispar)

    W. Ciesla, Forest Health Management International,

    Noxious Weeds

    Noxious weeds are plants that are regulated by the Weed Control Act, administered by the Nova Scotia Department of Agriculture. For more information about the act and the species listed, visit the website:

    G. Smith, CFS,

    Brown spruce longhorn beetle
    (Tetropium fuscum)

    Gary Alpert @ en.wikipedia

    European fire ant
    (Myrmica rubra)

    R. Anderson, USFS,

    Dutch elm disease
    (Ophiostoma ulmi; O. novo-ulmi)

    M. Godwin, CARP

    Common reed
    (Phragmites australis)