non-indigenous predators, parasites, pathogens or herbivores are typically, although not always, collected in the native habitat of the pest. The organisms to be released are quarantined to address biosafety concerns while non-target-host testing and other tests take place. Introductions can involve large numbers of individuals in one environment or smaller numbers in several different habitats or localities. After establishment, the introduced species and the pest are both expected to persist indefinitely at low numbers, which provides long-term control. This method is suitable if long-term persistence is desired and if non-target risks are low.