Which method is NOT considered part of biological control in vector management?

The method that is not considered part of biological control in vector management is the use of synthetic pesticides. Biological control relies on utilizing natural mechanisms to manage vectors, aiming to reduce or eliminate pest populations through natural enemies or beneficial organisms.

The other methods align with biological control principles. Using natural predators involves introducing or conserving species that prey on the target vectors, effectively managing their populations in an ecological manner. Introducing beneficial microorganisms can involve using bacteria or fungi that either infect or outcompete the vectors, promoting a more balanced ecosystem. These strategies are all aimed at leveraging ecological relationships rather than applying chemical substances that may disrupt local ecosystems.

In contrast, synthetic pesticides are chemical substances designed to kill or repel pests and are typically part of a chemical control strategy, which stands apart from the ecological-based approaches of biological control.