“Essentially immune to pesticides”
By MORGAN WINSOR Jul 3, 2019
ABC News – 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.
The findings were published in the journal Scientific Reports last month.
“This is a previously unrealized challenge in cockroaches,” the study’s lead author, Michael Scharf, said. “Cockroaches developing resistance to multiple classes of insecticides at once will make controlling these pests almost impossible with chemicals alone.”
The researchers tested three methods of professional-grade insecticides on German cockroaches at multi-unit buildings in Indiana and Illinois over a six-month period in 2016.
First, they rotated between three different insecticides each month for three months and then repeated. Second, they used a mixture of two insecticides sprayed monthly.
Lastly, they used a single treatment — abamectin gel bait — once a month in an area where cockroaches showed a low resistance to abamectin.
The third method was “the only strategy to successfully reduce cockroach numbers,” according to the study, but only in populations that had low-level starting resistance to the abamectin … Read more.
Florida Scientist: Newly evolved superbug is “the species that gives all other cockroaches a bad name.”
Newsweek – Cockroaches are developing a resistance to insecticides used in exterminators’ bug spray and may soon be “almost impossible” to control with chemicals alone, scientists warn.
New research recently published by Purdue University in West Lafayette, Indiana, has suggested that a strain of German cockroach—Blattella germanica L.—will only become more difficult to eliminate as future generations are becoming increasingly immune to human efforts of population control.
Such control is very necessary, scientists said, because the pests are often a threat to human health. They can spread bacteria and the feces they produce trigger allergies and asthma in adults and children …
The University of Florida’s Institute of Food and Agricultural Sciences describes the type of bug being tested as “the species that gives all other cockroaches a bad name.”
It says they are “unable to survive in locations away from humans or human activity” and thrive in warm indoor areas with access to food and water.
According to Purdue researchers, insecticides used to control their spread come in different classes and each works differently to kill cockroaches.
Bug sprays often contain a mixture of multiple classes to make sure that at least one will have an impact on the tough insects. New experiments aimed to test their effectiveness … Read more.
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