With ultrasonic pest repellers, no more cheesy mousetraps or mosquito plugs you forget to unplug in the morning. This device is described as revolutionary by many specialized media.
However, some users have expressed their skepticism and even disappointment on the forums. So what to think about it? Are wave repellents really effective?
How does the ultrasonic repellent work?
We can hear sounds up to 20,000 Hz, but not beyond. Frequencies above 20,000 Hz are called ultrasound.
However, many animals are sensitive to these frequencies. The repellent will therefore emit high frequency sounds, inaudible to the human ear, which will disturb them.
Some devices do not hesitate to couple ultrasound and infrasound. High frequencies disturb the eardrums and low frequencies vibrate the air and the ground.
Which animals are sensitive to ultrasound?
They are numerous. A 2007 study by Heffner and Heffner titled “ Hearing Ranges of Laboratory Animals ” showed that rabbits, mice, dogs or rats are sensitive to high frequencies.
Some insects also perceive high frequencies: this is the case of cockroaches, flies, mosquitoes, but also wasps or beetles. On the other hand, these species do not react at the same frequencies.
In addition, the organs involved in perception are not the same. In cockroaches, they are vibratile cilia while in flies or beetles, it is the tympanic membrane.
The limits of ultrasonic repellents
Ultrasonic Pest Repeller have many advantages. They are not expensive and they do not pollute, but they nevertheless have two structural limits:
High frequency waves do not pass through walls. The device will therefore be more efficient in an open warehouse than in offices.
Animals easily adapt to sound. If your device doesn’t have a frequency modulator, the pests will return sooner or later.
Ultrasonic pest repellants: a scam or not?
A study from the University of Kansas focused on testing the effectiveness of ultrasound on insects. The results are edifying: on mosquitoes, ticks or lice, high frequencies have no effect. For cockroaches, success is around 30%. Another observation: Ultrasound works when it is at a precise frequency and distance.
In rats, the results are a little better. The experiences of Greaves and Rowe have shown that strategically placed cameras could limit invasions rodents or divert to other food sources. However, the discomfort is limited.
The effects of high frequency sounds on pests have been the subject of hundreds of studies and the conclusion is: No ultrasound device has given satisfactory results. Some devices sold commercially work, but under very specific conditions and only on certain types of animals. You will understand: if the rats have taken up residence in your premises, nothing beats a rat control.