Ultrasound and Insects

Ultrasonic Pest Repellers are used as substitute for Mosquito coils and liquids to avoid inhaling of toxic fumes. It is the non toxic way to repel pests like mosquitoes. This article describes the relationship between Ultrasound (US) and Insects.

Ultrasonic Pest Repellers are used as substitute for Mosquito coils and liquids to avoid inhaling of toxic fumes. It is the non toxic way to repel pests like mosquitoes. As per scientific information and experimental evidences, the animals respond to US and avoid its presence. Small mammals like Dogs, Cats etc. responds to 22-25 kHz US and Rats to 60-72 kHz. Insects like Mosquitoes, Flies responds to 38-44 kHz.

What is Ultrasound?

The hearing property of human ear is limited. Human ear can perceive sound with in a frequency range of 20 Hz to 20 kHz. The sound frequency below 20 Hz is Infrasonic sound and above 20 kHz is Ultrasonic sound. Human ear is not sensitive to US because the eardrum cannot vibrate as fast as US. Ultrasound has high frequency, so the wave is very powerful. US travel along straight line even in the presence of obstacles. When the US hits an object, it bends and round and spread in all directions.

You can buy electronic mosquito repellents here or here.

What is the relation between (US) Ultrasound and animals?

Even though human ear cannot sense US, many animals can produce and hear US. Many insects, rodents, bats and small mammals communicate through US. Insects have sensory structures to produce and detect ultrasound. Cockroaches have “Sensory hairs” to sense US. Spiders, Wasps, Beetles, Flies etc have a “Tympanic membrane” to detect US. Fleas communicate using high frequency US . Male Mosquitoes produce US to attract females. Female mosquitoes have sensory structures to receive US. Spiders, lizards also have ability to sense US.

How does US affect animals?

The US sensors are present in the antennae of Mosquitoes and genetalia of Cockroaches. US emitted by the Repeller will scare away the pests and confuse them. Ultrasonic sound will create stress on the nervous system of insects and jam their own US frequency. This will immobilize the insects and they escape from the source of US.

Does the US pass through walls?

No. Ultrasound will not pass through walls like the ordinary sound waves. When the US hits an object,it bends and round the object and spreads.

How does ultrasound repel pests?

US pest chasers are designed to repel pests from the home. Rodents respond to US with a frequency around 60 kHz. Cats and Dogs can be repelled using 22-25 kHz. Insects like mosquitoes, House fly, Fleas etc responds to 38-44 kHz. US will create high pressure on the eardrum of Rats so that they move away from US source. US generally creates stress on animals, so they avoid ultrasound.

How does Ultrasound repel Mosquitoes?

Male mosquito is the natural enemy of female mosquito after breeding. Both male and female mosquitoes use plant juice as food. But female mosquito requires human blood protein for the maturation of their eggs. Male mosquitoes will not bite human beings. On the first day of emergence, the female mosquito will not bite but after mating with male it starts to bite human beings to get blood. Female mosquito will not allow males to mate again and they avoid the presence of males. Females detect the presence of males by sensing the US produced by the males. If an US generator is used, it will imitate male mosquito by producing 38 kHz US . This will repel Female mosquitoes. Moreover the US will create stress on the US sensillae present on the antenna of female mosquitoes, so the move away from the source of US .

Is it safe for human beings?

US Pest Repellers are widely used in Homes, Gardens, Farm yards etc. to repel various kinds of pests. Commercial US Pest Repellers are designed to emit US in the frequency range 20 kHz to 100 kHz. US above 20 kHz is inaudible to man but children can hear the US to a certain level up to 30 kHz. Many house hold appliances like Telephone, Computer, Vacuum cleaner etc emit US, but we cannot hear it because it is inaudible. US is considered as the safest method for scanning pregnancy. US scanning is widely used in hospitals. Echocardiogram also uses US to image the heart’s functions. As per the scientific information, US will not cause any health problems.

What are the important aspects of ultrasound pest chasers?

Most ultrasonic pest Repellers do not give better results due to one of the following reasons.

  • Power output of the Transducer. If the power output is low, pests will ignore the sound.
  • Direction and angle of sound. Usually ultrasound travels at an angle of 45 degree from the source. If there is an obstacle in the path, some of the sound waves will reflect and bend. This reduces the coverage area.
  • Response to animals. Usually small animals respond to US. These devices are used to repel pests from houses, farm yards, garden etc. The response depends on the number of pests in the population and the number of US waves reaching in their vicinity.
  • Some animals will ignore the US initially but later they avoid it. Some other animals, first show response and later learn to adjust with it.
  • Mosquito population is very large when compared to other animals. So the number of mosquitoes showing response is a matter of observation.

Is there any safety recommendations?

US is biologically safe to human beings as per scientific information. But US frequency close to 30 kHz can be sensed by children to a certain level. So it is recommended not to use such devices continuously near the children below 5 years.

Response of Animals to Ultrasound

  • 22-25 kHz: Dogs, Cats
  • 38-44 kHz: Mosquitoes, Fleas, House Fly, Spiders, Cockroaches
  • 52-60 kHz: Lizards
  • 60-72 kHz: Rats


Join the conversation!

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  • armiun68gmail-com

    The camel hearing range – what frequencies can camels hear?

  • Vaibhav

    Which frequency Fly and Mosquitoes keep away??

  • laura iancu

    this is working for the flea infestation i have as well as spraying the floor with vinegar or apple cider vinegar, and bathing the cats with face towel with the apple cider vinegar as well. i use 4 ounces in quart bowl and the rest warm water, put the face towel in and start making my rounds wiping them all down. i had my first night last night with out being woke with a bite on me. download it and then loop it : D please keep in mind, all beings are different chemistry and respond differently : D

  • John

    Probably what Ashley says is true but its equally hard to prove….

  • Ashley O'Brien

    There is absolutely NO evidence or proof that these ultrasonic repellants work! no scientific proof at all! so anyone who says it works is either lying or just doesnt know what they are talking about! and another thing, I cant believe how illiterate some of these people are! hald of these post’s seem like they are written by a 4 year old! not to mention the fact that they dont even know that these things are absolutel rubbish, after all, its very common knowledge-even if you didnt know, how hard is it to use a search, on google or something?! idiots! that other guy was quite right about that rediculous statement that the US has high frequency and so is very powerful! ha! what a load of total rubbish!!! anyone who would fall for this nonsense needs to go back to school..seriously! on the subject of scientific research backing these things up-yes, ultrasonic sound at high volume from a small transducer (like a small speaker designed specifically for U.S) aimed directly at a small container with some live fleas in it might be very unpleasant for the fleas,and may even damage them if the sound frequency was tuned to a resonant frequency of part of he fleas phyical anatomy (just like how ultrasound can be tuned to break a wineglass or a window), in actual fact,that same resonant frequency idea can be aplied to the human body as well, I believe around 7 Hertz is supposed to be very painful and dangerous to human organs if it is loud enough-thankfully generating this kind of frequency and volume is not easy-people who have been exposed to it have sworn that they saw ghosts and all sorts of weird phenomena-but it turns out that all it was doing was vibrating their eyeballs in weird ways,causing their vision to play up,and also cause nausea as well, it can happen with very large machinery with slowly moving parts, like old service lifts etc for there.!

  • Chandra Sheker

    I invite to partner with person having knowhow to manufacture ultrasonic Mosquito Repellents. You are requested to contact me,

    • Manzoor

      Bro….pls. send me the full data and requirements for this project,,,n also the design…..kindness
      Thank u !!!!!

    • Hossain

      I am interested to work with you

    • John King

      I have just read your requesr for a Partner to manufacture mosquito repellants using ultrasounds.

      I am an electronics engineer and have just finished a new design of the type of instrument you need. It will generate any ultasound frequeny up to 100 KHZ or more. It has 7 buttons to choose which insect you want to chase away.

      Button 1 : Dogs and cats, monkeys
      Button 2 : mosquitoes, flies, spiders and cokroaches.
      Button 3 : Lizards
      Button 4 : bats
      Button 5 : rats and mice
      Buttons 6 & 7 can be set for any other spot sounds up to 100 Khz ; for example any wild animals.

      The instrument is unique because for each sound the sound varies automatically over a range so that all insects are affected and none can get used to the same sound.

      The instrument works from a mains supply 230V/110 v AC 50/60 Hz, or a 12 Volt battery. Another version of the same instrument générâtes each of the seven sacred Chakra tones for use with headphones or loud-speaker hi-fi system.. This replaces seven Crystal singing-bowls as used by Tibetan monks.
      The design and prototype are complete and tested but the instrument is not yet in commercial production and so I must find a Partner to manufacture it at lowest possible cost.

      I live in France and cost of making it here is too high.

      If you are interested please contact me by email.

      PS I work for myself and I own the design.

      Thank you.

      John King

  • Chandra Sheker

    Can some one suggest me where to purchase an Ultrosonic Mosquito repellent in Bangalore,India?

  • Robert Leslie

    andRoaches own New Orleans, where I live, but using diatomaceous earth (found at garden and pool supply stores) and sticky strips keeps them under control even though they constantly find their way in. As to ultra sound..Well roaches survive radiation from atomic blasts, quickly become immune to poisons like boric acid and begin eating it for breakfast, so..they must be one of those insects mentioned that get used to ultrasound and simple ignore it. 🙁

    • ydlv

      Robert its extremely important to your health that you understand that the DE or diatomaceous earth you use for insects and anything else, is not the same as the DE you obtain for pool supply as that DE is coupled with silica which is harmful to humans and our respiratory system. The DE you should use is food grade and sometimes referred to as fossil flour. It is collected from the ocean floor and is a prehistoric single celled skeletal dust that is harmful to us but deadly to insects with an exoskeleton armor. The diatoms literally shred through the exoskeletal exterior of the pest and it then dies from dehydration. I am a farmer and gardener and use it for pests such as fleas, poultry mites, spider mites and on occasion, ants. I don’t like to kill ants as they are crucial to our eco system but will do it if I can’t control where they dine, like in my kitchen. I also put a measure in the animal’s food about every 3 months for deworming. DE is an organic and conscientious way to control pests. Please be sure for your health and your kid’s and neighbors’ that the DE you use is food grade. Here’s a link:

  • how to kill german roaches

    Rooaches are usually searchig for a straightforward meal plus they will feed to the meals in a
    vedry fridge and will also benefit from the bits of foodxs
    still left onn dirty dishes. Traps ccan aldo be sed as it is helpful in catching
    roaches byy attracting them and then trapping them by adhesive.
    Thhe etymological origins of the word exterminate are
    found in the Latin word “exterminare,” which literally means to drive out, expel.

  • kristel

    Do you have any idea on how to kill scale insects? do they also have a certain frequency range that can interfere/kill them?

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