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Aside from more wide-spread human travel and more transient population, the biggest reason beg bugs is becoming an epidemic is the way pesticides are used.
From my understanding, these days exterminators tend to rely mostly on baiting methods whereas in the old days, parameter control was more widely practiced... frequently spraying pesticides along walls and other areas beg bugs might attempt to cross with the emphasis of not killing them directly, but rather keeping them out and let nature do the rest.
I mention all of that because there's a folklore that banning DDT was the reason for bed bugs making a comeback - not as simple as that, it's mostly due to the way pesticides are used that changed in recent decades...
Even in the heyday of DDT, many bed bugs were already very DDT resistant, but still sought to avoid contact with it, hence the illusion that DDT was the answer when in reality any decent pesticide used as parameter control was effective.
In short, look at how exterminators deal with pests these days - notice they rarely spray much, but rather rely on baiting / dealing with the problem afterwards, instead of proactively spraying regularly to keep pests out.
Ron
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Domagon - Website Management and Domain Name Sales
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