What is an example of a biorational pest control method?

Using insect growth regulators is an example of a biorational pest control method because these substances specifically target the processes that insects rely on for growth and development. Insect growth regulators work by disrupting the normal hormonal functions of pests, which can hinder their ability to mature and reproduce without exerting a broad-spectrum toxic effect. This targeted approach is characteristic of biorational methods, as it aims to manage pest populations in an environmentally responsible way while minimizing harm to non-target organisms including beneficial insects, plants, and humans.

Other methods such as spraying with broad-spectrum insecticides and applying herbicides like Round-up are less selective and can adversely affect a wide range of non-target species. Manually removing insects, while effective in some contexts, does not involve a chemical method and is more labor-intensive; it also may not be practical for large-scale pest management. Thus, the choice of insect growth regulators aligns with the principles of biorational pest management by focusing on a specific mechanism that diminishes pest populations while conserving beneficial species.