09086: Parkinsonia control in the Upper Fitzroy Catchment

    Parkinsonia (other name: Jerusalem thorn) is a branched spreading tree native to South America. In Australia, it out-competes native species, chokes wetlands and creates impenetrable thickets and is now found across much of the northern half of the country.

    The species reproduces by seed with mature plants producing 5000-13 000 seeds. The seed pods float large distances from upstream infestations. It has been declared one of 20 weeds of national significance, and is regarded as one of the worst weeds in Australia because of its invasiveness, potential for spread, and economic and environmental impacts.

    This project intends to control Parkinsonia infestations on the upper Fitzroy River and its tributaries by employing 'bush regeneration' weed control techniques, a process whereby individual plants are located for basal bark chemical application, as opposed to broad-scale chemical application.

    Bush regeneration methods ensure that desirable native species are left in-situ around the target plant and promote quicker regeneration of the native suite of species. The approach is labour intensive, but extremely desirable when considering the speed with which native species are able to recolonise.

    Investment: $ 36 000
    Delivery organisation: Australian Wildlife Conservancy
    Project duration: July 2010 - October 2012
    Location: Upstream from Dimond Gorge on the Fitzroy River and including the Little Fitzroy River, Adcock River, Annie Creek and Throssel River system
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