Thick-skinned bed bugs beat commonly used bug sprays

April 13, 2016, University of Sydney
The common bed bug, Cimex lectularius L. Credit: David Lilly

The global resurgence in bed bugs over the past two decades could be explained by revelations that bed bugs have developed a thicker cuticle that enables them to survive exposure to commonly used insecticides, according to University of Sydney research published today in PLOS ONE.

Bed bugs are blood suckers that produce intense bites and cause significant financial heartache in the hospitality and tourism sectors. Understanding why they have again become so common may help develop new strategies for their control.

Resistance to commonly used insecticides is considered the main reason for the global resurgence in bed bugs, according to University of Sydney PhD candidate, David Lilly, whose research focuses on the biological mechanisms that help bed bugs survive exposure to commonly used insecticides.

"The new findings reveal that one way bed bugs beat insecticides is by developing a thicker 'skin', said David Lilly.

"Bed bugs, like all insects, are covered by an exoskeleton called a cuticle. Using scanning electron microscopy, we were able to compare the thickness of cuticle taken from specimens of bed bugs resistant to insecticides and from those more easily killed by those same insecticides."

Comparing the cuticle thickness of the bed bugs revealed a stunning difference: the thicker the cuticle, the more likely the bed bugs were to survive exposure to the insecticides.

The new findings could explain why failures in the control of bed bug infestations are so common. They may also unlock new pathways to developing more effective insecticides for bed bug control.

"If we understand the bed bugs use to beat , we may be able to spot a chink in their armour that we can exploit with new strategies," said Mr Lilly.

But measuring the thickness of bed bug cuticle wasn't an easy task, he said: "The findings are exciting but collecting data was frustrating. Taking microscopic measurements of legs requires a steady hand and patience, lots of patience."

Explore further: Bed bugs that feed are more likely to survive pesticide exposure

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1 / 5 (1) Apr 14, 2016
they banned DDT, the most effective insecticide ever, 40 million Africans and Asians died, and things like bedbugs are on rampant rise. Oh, but the envirokooks did save a some bird eggs....
Apr 14, 2016
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not rated yet Apr 14, 2016
And DDT causes 2-3 generations of brain birth defects to the offspring of people exposed to it, especially as children.
Apr 14, 2016
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not rated yet Apr 17, 2016
1 part cedar oil
9 parts mineral oil
... it is slippery on the floor but bedbugs cant stand it.

not rated yet Apr 17, 2016
bring back ddt, problem solved. Works on zika, yellow fever, and malaria virus/bacteria/parasite carriers as well.

Generally eradicating mosquitoes from the environment would be a good start.

Humanity first.

Save America -- Re-elect no one.

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