Final answer:
The given statement is true as drift from a treatment site can indeed expose non-target pest species to treatment measures, such as pesticides or natural predators, potentially leading to unintended ecological impacts. Hence, this statement is true.
Step-by-step explanation:
The statement is true: Drift beyond a treatment site may result in the exposure of non-target pest species. This drift can occur in various forms of ecological management, such as the use of pesticides or in biological control operations where natural predators are introduced to control pest populations. A famous example of non-target impacts is the decline of raptor populations from DDT residues that caused thin eggshells.
While newer treatment methods and substances can have reduced non-target effects, there are still risks involved. These include the potential for biological control agents to attack non-target species and in some cases, cause extinctions. Examples of this include a predatory lady beetle introduced to control scale insects but impacting other species unintentionally.
Therefore, while biological control can offer effective, low-cost, and enduring solutions to pest issues, it comes with the risk of non-target species being affected.
Hence, the statement is true.