Prevention is the best and first line of defense when it comes to managing invasive species, but even the best prevention efforts will be unable to stop all invasive species from becoming established in a given area. Early detection and rapid response (EDRR) increases the likelihood that invasions will be controlled while populations are still localized and at low levels that can more easily be contained and eradicated. Once an invasive species becomes well established, it is significantly more difficult and expensive to control (Figure 1). In many cases, once a species reaches that point, all that may be possible is a lessening of their negative impacts.
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