Which method is considered the least effective way to control invasive pests?

Using pesticides exclusively is considered the least effective way to control invasive pests because this method often addresses only the symptoms of the problem without tackling the root causes. Pesticides may reduce pest populations temporarily, but they do not provide a long-term solution and can lead to several issues, such as pesticide resistance in the pest populations, non-target organism harm, environmental contamination, and the disruption of local ecosystems.

In contrast, methods such as mechanical removal can physically eliminate pests, encouraging natural predators can help maintain ecological balance, and regular monitoring allows for timely interventions and assessment of control methods' effectiveness. These alternative strategies promote a more sustainable approach to managing invasive pests by integrating multiple control methods rather than relying solely on chemical solutions.