Pest Organisms / German Cockroach
Treatment
for German Cockroach
Begin with monitoring: the leading device for cockroaches is the adhesive-coated cardboard trap — the familiar "sticky trap" — set close to where roaches are likely harboring. Source: https://schoolipm.tamu.edu/forms/pest-management-plans/ipm-action-plan-for-german-cockroaches/ Source: https://ask.ifas.ufl.edu/publication/IN1190
Bait does the heavy lifting. UF/IFAS lists active ingredients that include indoxacarb, abamectin, and fipronil; UC IPM independently cites those same three (along with others) as cockroach-bait actives. Source: https://ask.ifas.ufl.edu/publication/IN1190 Source: https://ipm.ucanr.edu/home-and-landscape/cockroaches/
Insect growth regulators (IGRs) keep immature cockroaches from developing normally, so they never reach reproducing adulthood — Penn State Extension independently describes IGRs preventing immatures from maturing and breeding. They work best applied into cracks and crevices, the same gel-bait placement both UC IPM and Penn State recommend. Source: https://ask.ifas.ufl.edu/publication/IN1190 Source: https://extension.psu.edu/got-roaches-eliminate-roaches-with-ipm Source: https://ipm.ucanr.edu/home-and-landscape/cockroaches/
Expect resistance: insecticide resistance has shown up in cockroaches for as long as people have been controlling them, a pattern UC IPM and Penn State independently confirm. Source: https://ask.ifas.ufl.edu/publication/IN1190 Source: https://ipm.ucanr.edu/home-and-landscape/cockroaches/ Source: https://extension.psu.edu/got-roaches-eliminate-roaches-with-ipm
Back up the chemicals with physical removal — vacuum up or wipe away individual roaches. Source: https://schoolipm.tamu.edu/forms/pest-management-plans/ipm-action-plan-for-german-cockroaches/