Cockroaches are becoming 'nearly impossible' to kill
Cockroaches are becoming 'nearly impossible' to kill
Cockroaches are becoming immune to insecticides researchers say
04 July, 2019, 03:03
"If even a small percentage of cockroaches is resistant to an insecticide, and those cockroaches gain cross-resistance, a population knocked down by a single treatment could explode again within months", the statement explains.
In the study, the scientists used multiple kinds of insecticides, leading them to realise that the cockroaches could have developed a resistance.
"This is a previously unrealized challenge in cockroaches", study author Michael Scharf, professor at Purdue University's Department of Entomology, explained in a release.
Bad news for anyone afraid of creepy crawlies - scientists are warning that cockroaches are getting harder and harder to kill.
Researchers from Purdue University found German cockroaches - the most common species worldwide - are becoming increasingly resistant to nearly all insecticides. Exterminators typically use a cocktail of different insecticides, which are divided into classes based on toxicity, chemical composition and other factors.
The report's authors tested this approach at multi-unit buildings in IN and IL over a six-month period.
While exterminators frequently rotate the types of insecticide they use on the job in case some roaches in a population are resistant to one class of chemical, the experiment's results indicate they will have to step up their game enormously if they want to have any impact on Blattella germanica.
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Scharf said resistance within a single generation of the cockroaches sometimes increased four- or six-fold. They also breed rapidly in suitable environments, with a female German cockroach having 50 offspring every three months. "We didn't have a clue that something like that could happen this fast".
To test the roaches' resistance, researchers used 3 different brands of insecticides on 3 different cockroach colonies in the span of six months.
The answer, according to Scharf, is an integrated pest management approach that combines chemical treatments, traps, improved sanitation and vacuums.
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