Effectiveness of site treatments

Source data:

• Van Wilgen et al. (2022) categorised WfW as a bold visionary project that has made laudable progress in many areas, but that has arguably lost focus from what was initially a very clear vision.

• Van Wilgen et al. (2020) found that control measures (other than biological control) have largely failed to check invasions at a national scale.

• Fill et al. (2018) assessed short-term vegetation recovery after alien plant clearing along the Rondegat River, South Africa

• Van Wilgen et al. (2017) assessed invasive alien plant control operations over several decades in the Kruger National Park

• Kraaij et al. (2017) assessed the effectiveness of invasive alien plant management in the Garden Route National Park

• Fill et al. (2017) assessed the effectiveness of invasive alien plant management in the Upper Berg River catchment

• Van Wilgen et al. (2016) documented the historical costs and extent of efforts to control invasive alien plants in the protected areas of the Cape Floristic Region and estimated the resources that would be needed to bring the problem under control within a reasonable timeframe

• Ntshotsho et al. (2016) explored the success of invasive alien plant clearing projects of the Working for Water Programme, using three case studies

• Van Wilgen and Wannenburgh (2016) reviewed the achievements and challenges in the Working for Water programme

• McConnachie et al. (2012) evaluated the cost-effectiveness of Working for Water in reducing invasive alien plant cover in the Krom and Kouga river catchments over 7 years

• Van Wilgen et al. (2012) assessed the effectiveness of the Working for Water programme over the past 15 years, by reviewing data from three national-level estimates of the extent of invasion, records of the costs and spatial extent of invasive species control operations, assessments of the effectiveness of biological control, and smaller-scale studies.

• De Lange & Van Wilgen (2010) found that although an estimated R6.5 billion was lost every year due to invading alien plants, this would have amounted to an estimated additional R41.7 billion had no control been carried out