Rat Repellent

There are no known commercially available rat repellents. Sonic and ultrasonic devices are either totally ineffective or are not practical rat repellents. No spray or concocted food source will repel these pesky rodents. For centuries, people have tried to find ways to repel or develop a magic trap that will eliminate rats. Humans are still searching.

There are two main types of pest rats in North America, the Norway rat and the roof rat. The roof rat has been here longer than the Norway rat, coming to the New World in the 1600’s. These rats are climbers and are also known as “ship’s rats.” Originating in Southeast Asia, these tree climbing rats most likely came to Europe and then rode ships to North America. These rats are cautious and hide when they are not moving. This creates a biological barrier to developing a repellent.

The most successful rat in North America is the Norway rat. This rat probably didn’t come to North America until about the time of the American Revolution. This rat, also known as the wharf rat or sewer rat, has spread throughout the most of North America. These rats are not climbers like their cousins the roof rat. On the ground level, there is usually ample food and harborage, or places to live. Repellents tried by scientists have failed.

Over the years, people have tried sprays, bad smells, repellent food, and even predators. The rats have always prevailed. Their sense of smell is excellent and they seem to be able to distinguish between food and repellents. They are rarely deterred by any type of repellents except physical barriers.

There is no substitute for closed doors, windows, and screening to physically repel or keep rats out of structures.