German cockroaches are broadly considered the hardest bug to get rid of, because their rapid reproduction cycle, resistance to common insecticides, and preference for tight harborage areas inside walls and appliances make complete elimination genuinely difficult without professional intervention.
What makes German cockroaches particularly stubborn is biology: a single female produces an egg case holding 30–40 nymphs roughly every six weeks, meaning a small infestation compounds fast. They also develop insecticide resistance within a few generations, so a spray that worked last season may be ineffective today. Bed bugs run a close second for the same resistance reasons, plus their ability to survive months without feeding. For indoor pest situations where you're catching individuals rather than treating an infestation, a bug vacuum like the BugZooka handles stink bugs, silverfish, and spiders reliably — but German cockroaches at scale require a different strategy entirely.
- German cockroach egg cases hold 30–40 nymphs each, with females producing a new case roughly every six weeks.
- German cockroaches can develop resistance to pyrethroid insecticides within just a few generations of exposure.
- Bed bugs can survive without a blood meal for 20–400 days depending on temperature and life stage.
- The BugZooka WB100 captures cockroaches reliably when approached steadily, but is suited to individual insects, not active infestations.