The German cockroach is very good at setting up an ecological area in structures and is durable in the face of lots of pest-control treatments. To be successful, control solutions should be thorough, sustained, and methodical; survival of just a few eggs is quite sufficient to regenerate a virtually exterminated pest population within a few generations, and recolonization from surrounding populations frequently is really fast, too.
German cockroaches prefer confined spaces, and they are small compared to other pest species, so they can hide within small gaps and crevices that are easy to miss, therefore evading humans and their extermination efforts.
A type of German cockroaches has emerged that responds to glucose as distastefully bitter. They refuse to consume sweetened baits, which presents a challenge to their control, considered that those baits are an economical and effective means of regulation.