These machines are designed to operate at a frequency that humans can’t hear but animals do. Ultrasonic Sounds Another type of repellent that is commonly suggested but won’t likely produce results is an ultrasonic sound machine. But five of the 10 odour repellents appeared to have some effect. These included naphthalene flakes, blood and bone, and garlic spray." However a recent study from UQ by Bradley Gale, Andrew Tribe and Luke Leung (in press 2014), concluded that the ultrasonic devices they tested “did not repel brushtail possums from feeding on a highly palatable food” and that the devices tested were not effective for repelling possums “from consuming food in suburban gardens”. However some people who have good high frequency hearing can hear it and don't always like. Units can have up to three speakers. Many substances have been used in the hope that they will stop possums eating garden plants. For greater coverage, choose a model with more speakers. The electronic repellers on the other hand repel animals with flashing light, sound or water. The average person will hear something if they are close, but they don't hear the high frequency sound that repels possums. There are endless individuals attempt to utilize mothballs, smelling salts, coyote pee, high-pitch ultrasonic sound blasters, standard radios, and so on, to dispose of opossums, however these things don't work. "A recent Deakin University study into 14 alleged taste and odour repellents found that when possums were hungry none of the taste repellents tested stopped them from eating what they wanted. Homemade Natural Possum Repellent. With sound waves from 15kHz – 25kHz. DELWP is not aware of any definitively successful, universal repellent Both Mathew and Happierjack have shared their own experiences. Sound variance. How to apply. A further optional audible setting is available if required. The Possum Deterrent emits high frequency sound. There is no compelling opossum repellent. To prevent pests from growing accustomed to the high-frequency noise, choose a unit that varies the sound. possum repellent spray doesn't work Possum Repellent Granules Don't waste money on solid-form possum repellents either, for many of the same reasons listed above about liquid or spray possum repellents. As well as being relatively cheap, starting off at $10-$20 and increasing dependent on the range covered and technology included, high frequency sound devices do seem like the ultimate perfect solution. In our review, we have selected the best possum repellents of all three types. a stark difference is going to be the concern that household pets or small children may consume the granules before they disperse into the ground. If possums have babies in the attic, those possum babies can make noises during the day when the mother possum leaves to get food or if there are issues with the baby possums. What kind of repellent do you use? The ultrasonic sound is emitted through speakers. The idea is that the possums and other wildlife will find the sound annoying and leave your property. You can hear possum sounds at all hours of the day, although possums are generally nocturnal. While possums aren't typically as devastating to a garden or yard as some other forms of wildlife, seeing them in … The Pestrol Possum Repeller deters possums by using ultrasonic sounds generated from the units as well as utilising a strobe light. In addition, some repellents are designed to repel because of their texture ('mouth feel'). You will come across MANY sound devices that are designed to repel wild animals, particularly when you take a few minutes to have a look online. Pestrol possum repeller emits an ultrasonic sound (inaudible to most humans) Adjustable settings to change frequency. The Wildlife Ecology and Conservation Department scientists give the following instructions on applying the repellents. Amazon.com : Wikomo Animal Repeller with Ultrasonic Sound Solar Powered Waterproof Outdoor Motion Sensor and Flashing Light Rabbit Repeller for Cats, Dogs, Squirrels, Moles, Martens, Possum, Hedgehog, New Version : Garden & Outdoor Possum repellents may work through two chemical senses: smell and taste. Opossums simply couldn't care less.