Compare mechanical, chemical, and legislative control to the use of nonnative species as a control method.

Non native species are organisms that do not naturally occur in a given area. They may have been transferred either accidentally or deliberately from their place of origin to the new area through human activities.

Non native species may become invasive species if they cause harm to the economy, human health, or environment.

Control methods used to eliminate invasive species are:

1) mechanical - physically removing the invasive species or changing the habitat condition of the affected area.

2) chemical - using of pesticides, fungicides, or herbicides to kill off invasive species.

3) legislative - introducing the natural enemy of the invasive species. It may be a predator or parasite that is from its native range.