Cockroaches are becoming 'almost impossible' to kill, researchers say

A common cockroach species is becoming essentially immune to pesticides, researchers said. A new study by researchers at Purdue University in West Lafayette, Indiana, found evidence that the German cockroach species is becoming harder to kill as the worldwide pest rapidly develops cross-resistance to multiple types of insecticide at one time. "This is a previously unrealized challenge in cockroaches," the study's lead author, Michael Scharf, said in a statement on June 25.