What is a recommended method to control rat populations in populated areas?

Warfarin is a commonly used method for controlling rat populations in populated areas because it is an effective anticoagulant rodenticide. When ingested, it interferes with the normal physiological process of blood clotting, leading to internal bleeding in rodents. This method is particularly effective in cases of significant rodent infestations where immediate and efficient population control is necessary.

When using a rodenticide like Warfarin, it's important to follow the recommended guidelines to minimize risks to non-target species, including pets and wildlife. It is also crucial to monitor the area for signs of dead or dying rodents to prevent secondary poisoning in scavengers.

Other control methods listed, such as snap traps, chemical repellents, and ultrasonic devices, may have their place in integrated pest management strategies. However, they might not offer the same level of efficacy in rapidly reducing large populations of established rats. Snap traps require a more hands-on approach and may not be as practical in densely populated urban settings, while chemical repellents can be less reliable due to varying effectiveness. Ultrasonic devices have not consistently proven effective in scientific studies and often do not attract or kill rodents as effectively as rodenticides.