# Ultrasonic bug repellants

**URL:** <https://boards.straightdope.com/t/ultrasonic-bug-repellants/472>\
**Category:** Cecil's Columns/Staff Reports\
**Created:** [January 26, 2000, 4:14am UTC](https://boards.straightdope.com/t/ultrasonic-bug-repellants/472 "2000-01-26T04:14:00Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Bletchley](https://avatars.discourse-cdn.com/v4/letter/b/7bcc69/32.png) [@Bletchley](https://boards.straightdope.com/u/Bletchley)\
**Post date:** [January 26, 2000, 4:14am UTC](https://boards.straightdope.com/t/ultrasonic-bug-repellants/472/1 "2000-01-26T04:14:00Z")

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In the current letter on Cecil’s column, he says these ultrasonic devices are useless against roaches.

Has anybody dropped a bunch of roaches near these bug repellers to see what they do?

I bet they don’t like it. But what do I know maybe they are attracted to the sound.

Try it and let us all know.

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**Author:** ![JillGat](https://avatars.discourse-cdn.com/v4/letter/j/9fc29f/32.png) [@JillGat](https://boards.straightdope.com/u/JillGat)\
**Post date:** [January 26, 2000, 4:57am UTC](https://boards.straightdope.com/t/ultrasonic-bug-repellants/472/2 "2000-01-26T04:57:00Z")

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This refers to the mailbag column, [http://www.straightdope.com/mailbag/multrasonic.html](http://www.straightdope.com/mailbag/multrasonic.html) . I’m moving it to the Mailbag forum.  
Jill