Biological Control:

The biological control of invasive species is an up and coming method for the control of invasive species, however, it does come with risks.  This method can be used to control insects, weeds, and plant diseases by introducing the “natural enemy” of the species.  This will be done by predation, parasitism, and herbivory.  The goal it so eliminate competition between native species that are needed to keep the ecosystem in balance and the invasive species that may take over the environment.   A concern is that the control species that is introduced to eliminate the invasive species may become invasive itself. 

An example is the use of leaf-eating beetles to control the invasive species, purple loosestrife.  These beetles are said to exclusively eat the purple loosestrife plant.  A concern is that the beetles may begin to consume other, native plants in the area and the beetle will then be invasive itself.