The guiding principles for each of the management categories in the matrix are discussed below. At a landscape scale these principles need to be interpreted in terms of the different outcomes needed for each land use for each weed. For example, a weed may rank as "destroy infestations" in one land use and "limited action" in others. In this case coordinated control may still be required in the latter land use to enable protection of the former land use. In assessing the management categories, it is important to consider the impact of weeds on individual sites and to manage weeds to protect these sites, if appropriate.
The term "geographic area" can be applied to a range of scales, for example it can be applied to the state of New South Wales, to regions or catchments such as groups of local councils or Local Land Services respectively, to individual Local Control Areas, and may even be applied to individual land management units, for example a farm or a National park.
Three management categories below, that is 'Protect Priority Sites', 'Manage Weed' and 'Manage Sites' discuss the need to identify key sites/assets in the geographic area and to manage these sites/assets from the weed threat. A process to determine biodiversity sites/assets that are at risk from weeds has been developed by Downey et al. (2009). Use of this process is discussed elsewhere (Johnson and Charlton 2009).
Species that are not known to be present in the geographic area being considered and which represent a significant threat. Such species would score "0" in feasibility of coordinated control due to their absence.
Aims to prevent the species arriving and establishing in the management area being considered
Aims to remove the weed species from the geographic area being considered
Aims to significantly reduce the extent of the weed species in the geographic area being considered
Aims to prevent the ongoing spread of the weed species in the geographic area being considered
Aims to prevent the spread of the weed species to key sites/assets of high economic, environmental and/or social value
Aims to reduce the overall economic, environmental and/or social impacts of the weed species through targeted management
Aims to maintain the overall economic, environmental and/or social value of key sites/assets through improved general weed management
Aims to detect any significant changes in the species' weed risk
The weed species would only be targeted for coordinated control in the geographic area being considered if its local presence makes it likely to spread to land uses where it ranks as a higher priority
The following matrix gives guidance on appropriate strategic weed management actions. Different weed species will appear in different positions on the matrix based on their weed risk and feasibility of coordinated control scores.
|Weed Risk||Feasibility of Coordinated Control|
|Limited Action||Limited Action||Limited Action||Limited Action||Monitor|
|Limited Action||Limited Action||Limited Action||Monitor||
Protect Priority Sites
|Manage Sites||Manage Sites||Manage Sites||Protect Priority Sites||Contain Spread||A|
|Manage Weed||Manage Weed||Protect Priority Sites||Contain Spread||Destroy Infestations|
Manage Weed |
Protect Priority Sites
|Contain Spread||Destroy Infestations||Eradication|
Author: Dr Stephen Johnson
Industry and Investment New South Wales
ORANGE NSW 2800