https://patents.google.com/patent/US4999201A/en
1. A method for controlling cockroaches, which comprises substantially airtightly forming a closed space where cockroach feces lie scattered, introducing ozone into the closed space to expose the cockroach feces present in the closed space to ozone at a concentration of 0.5 ppm to 20 ppm, continuing the exposure to ozone for a period of time of about several ten minutes up to about 8 hours so as to cause the cockroaches present in the closed space during treatment to die and to denature an aggregation pheromone contained in the cockroach feces so as to form a roach-repellent substance.
2. The method according to claim 1, wherein at least one ultraviolet lamp or ozonizer is disposed in the closed space and continuously operated to produce ozone in the closed space.
3. The method according to claim 1, wherein ultrasonic vibration is applied to the cockroach feces being exposed to ozone to improve denaturing efficiency to the roach-repellent substance.
4. The method according to claim 1, wherein ozone is produced in an atmosphere of high-concentrated oxygen to improve denaturing efficiency to the roach-repellent substance.
