Biological control
Classical biological control: This is the introduction of natural enemies to a new area where they did not originate or do not occur naturally. Thereafter, the predator lives as a natural part of the habitat, reproducing and killing the pest species. This method is especially effective when the pest is itself an invasive or introduced species in the area. Free of its natural enemies, the pest multiplies to huge numbers. The introduction from its homeland of an enemy or two can be very successful. One example is the use of Larinus planus to control the Canada thistle.