Posted: Mar 20, 2013 6:00 pm
by Calilasseia
Oh, look. A scientific paper.

Responses Of Mosquitoes And German Cockroaches To Ultrasound Emitted From A Random Ultrasonic Generating Device by Aqeel Ahmad, Bhadriraju Subramanyam & Ludek Zurek, Entomologia Experimentalis et Applicata, 123: 25-33 (2007) [Full paper downloadable via the above link].

Ahmad et al, 2007 wrote:

Abstract. The repellency of ultrasound to females of two species of mosquitoes, Anopheles quadrimaculatus Say and Anopheles gambiae Giles (Diptera: Culicidae), and male and female German cockroaches, Blattella germanica (L.) (Blattodea: Blattellidae), was evaluated under laboratory conditions using a random ultrasonic device developed at Kansas State University. This device produces ultrasound in the 20–100 kHz frequency range and random sound patterns at any frequency range. Under the particular settings described in the paper, this ultrasonic device produced sound pressure levels from 91 to 101, 91 to 102, and 90 to 100 dB at the top, bottom, and side panels of the test chamber, respectively (0 dB = 20 micropascals). Sound pressure levels recorded at the center of the top, bottom, and side panels were higher than those recorded at the panel edges. Ultrasound from the random ultrasonic device failed to repel mosquitoes and German cockroaches at the different frequency ranges evaluated. Our results confirm previous findings with commercial devices producing constant sound patterns that ultrasound in general is not a promising tool for repelling mosquitoes and cockroaches.

Another relevant paper is this one:

Acoustic Methods Of Monitoring And Manipulating Insect Pests And Their Natural Enemies by Thomas J Walker, from
Pest management in the subtropics: integrated pest management - a Florida perspective, 1996 pp. 245-257 (ISBN
0-946707-63-4) [Full paper downloadable from here]

That paper is pretty revealing with respect to the problems involved in using sound as a means of affecting insect behaviour.