Updates to our Terms of Use

We are updating our Terms of Use. Please carefully review the updated Terms before proceeding to our website.

Friday, June 14, 2024 | Back issues
Courthouse News Service Courthouse News Service

How cockroaches spread around the globe to become the pest we know today

Researchers said exploring how cockroaches conquered past environments may lead to better pest control.

DALLAS (AP) — They're six-legged, hairy home invaders that just won't die, no matter how hard you try.

Cockroaches are experts at surviving indoors, hiding in kitchen pipes or musty drawers. But they didn't start out that way.

new study uses genetics to chart cockroaches' spread across the globe, from humble beginnings in southeast Asia to Europe and beyond. The findings span thousands of years of cockroach history and suggest the pests may have scuttled across the globe by hitching a ride with another species: people.

“It’s not just an insect story,” said Stephen Richards, an assistant professor at Baylor College of Medicine who studies insect genes and was not involved with the study. “It’s an insect and humanity story.”

Courthouse News’ podcast Sidebar tackles the stories you need to know from the legal world. Join our hosts as they take you in and out of courtrooms in the U.S. and beyond.

Researchers analyzed the genes of over 280 cockroaches from 17 countries and six continents. They confirmed that the German cockroach — a species found worldwide — actually originated in southeast Asia, likely evolving from the Asian cockroach around 2,100 years ago. Scientists have long suspected the German cockroach's Asian origins since similar species still live there.

The research was published Monday in the journal Proceedings of the National Academy of Sciences.

The cockroaches then globe-trotted via two major routes. They traveled west to the Middle East about 1,200 years ago, perhaps hitchhiking in soldiers' breadbaskets. And they may have stowed away on Dutch and British East India Company trade routes to get to Europe about 270 years ago, according to scientists' reconstruction and historical records.

Once they arrived, inventions like the steam engine and indoor plumbing likely helped the insects travel further and get cozy living indoors, where they are most commonly found today.

Researchers said exploring how cockroaches conquered past environments may lead to better pest control.

Modern-day cockroaches are tough to keep at bay because they evolve quickly to resist pesticides, according to study author Qian Tang, a postdoctoral researcher studying insects at Harvard University.



The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.

Categories / History, Science

Subscribe to Closing Arguments

Sign up for new weekly newsletter Closing Arguments to get the latest about ongoing trials, major litigation and hot cases and rulings in courthouses around the U.S. and the world.