Which strategy aims for long-term pest prevention through ecosystem-based methods?

The strategy that focuses on long-term pest prevention through ecosystem-based methods is Integrated Pest Management (IPM). This approach recognizes the complex interactions within ecosystems and aims to manage pest populations in a way that is sustainable and reduces reliance on chemical pesticides.

IPM employs a variety of techniques, including biological control (using natural predators), habitat manipulation (altering the environment to make it less hospitable to pests), and cultural practices (modifying agricultural practices to reduce pest pressure). The goal is to strike a balance between ecological health, economic viability, and effective pest control, leading to long-term solutions rather than short-term fixes.

The other strategies listed do not specifically aim at pest prevention through ecosystem-based practices. Post occupancy evaluation refers to assessing buildings after their completion to inform future projects and does not focus on pest management. Greywater reuse involves the recycling of wastewater for non-potable purposes, which is related to water management and not pest control. Traditional zoning is concerned with land-use planning and regulation and does not address pest control strategies. Thus, Integrated Pest Management is the most appropriate choice for achieving long-term pest prevention through ecosystem-based methods.