Using biological control against IAPs: do we know when to stop?

Using biological control against IAPs: do we know when to stop?
John H. Hoffmann
University of Cape Town

Although biological control has been used very successfully against invasive alien plants in South Africa for many years, there are often uncertainties in perceptions of what has been achieved. Usually there is an expectation that more control effort is needed.  These misconceptions could lead to resources being directed to projects where they are not really required, to the detriment of more needy projects.  Some historical and recent examples are presented here to illustrate this trend, highlighting a need for more deliberation before additional control efforts are made to existing bio- control projects.