How can a pest be defined simply?

A pest can be simply defined as any unwanted organism. This definition encompasses a wide range of organisms that can be detrimental to human activities or well-being, including plants, insects, animals, or microorganisms. The notion of being "unwanted" is key, as it applies to organisms that may interfere with human comfort, health, or economic productivity.

This definition allows for a broader understanding of what constitutes a pest beyond just economic impact or health risks. While some pests may indeed cause economic losses, not all unwanted organisms fit into that category. Similarly, though certain pests may spread diseases, this is just one of many undesirable effects they might have. By focusing on the concept of undesirability, we capture the essence of a pest in a more inclusive manner, making it applicable to many contexts in pest management and control.