Electronic insect repellents are small ultrasonic devices that emit high frequency sound waves, the purpose of which is to repel or scare away insects. Some insect species--such as wasps, spiders, ...

All are well-known repellents in the cockroach world, but not particularly lethal or poisonous. $36.99 at Amazon When sprayed around the perimeter of your property, Ortho Home Defense Insect ...