Journal
AUSTRALIAN JOURNAL OF EXPERIMENTAL AGRICULTURE
Volume 48, Issue 4, Pages 568-574Publisher
CSIRO PUBLISHING
DOI: 10.1071/EA07117
Keywords
environmental weeds; weed risk management
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Many plant species with agronomic potential have been introduced for livestock forage and have subsequently become weeds of natural ecosystems, or 'environmental weeds'. Stringent border quarantine procedures introduced by Australia in 1997 ensure few high weed risk species are now imported into the country; however, there are no protocols for assessing and managing weed risk in use on a national scale 'post-border' (i.e. once a plant species is in the country). Environmental weed risk management in forage improvement programs aims to minimise the risk that new species and cultivar introductions will be invasive in natural ecosystems. We describe an environmental weed risk assessment (EWRA) model specifically aimed at assessing the weed potential of exotic and native forage species. The EWRA model predicts and ranks species for weed risk by assessing invasiveness, impacts and potential distribution. Assessments are based on published evidence, experimental observations and intuitive responses from experienced pasture researchers, in collaboration with weed experts. This model specifically addresses the need for environmental weed risk management in forage improvement programs.
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