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Why stink bug populations are booming in 2017 (and what you can do about it)

A "stink bug" sounds like an insult from a fifth-grader, but it's a real insect posing a real problem to homeowners across the country.

Stink bugs don't sting, bite or carry disease. But they do, um, stink. Badly. And once you notice them in your home — and trust us, you'll notice — it's too late to do a whole lot about them.

Peter Jentsch, an entomologist from Cornell University, gave TODAY Home the scoop on where these smelly pests come from, how they operate and what we can do about them (including a do-it-yourself booby trap for stink-free capture!).

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Here to stink up your home!

Jentsch explained that the BMSB (brown marmorated stink bug), which is native to Asia but common across the U.S., goes through population cycles every couple of years. Fluctuations between warm temperatures and plummeting cold in 2015 left stink bug populations unprepared for freezing winter temperatures, causing the population to dwindle.

Now, the survivors are rebounding — hard — particularly in moist, temperate climates like those on the Eastern seaboard and in the Pacific Northwest. After spending spring and summer feasting outdoors, stink bugs seek shelter from the elements — by making their way into homes through cracks, open windows and air-conditioning vents.

They tend to gravitate toward homes with a heavy tree canopy, and hang out on the upper floors. So if you spot flat brown bugs crawling along your bedroom ceiling or flitting around your attic — or catch a whiff of something fruity and foul — it's officially time to panic.

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Stink bugs gravitate toward homes with a heavy tree canopy, and hang out on the upper floors.

About that stench — what Jentsch describes as a the stink bug's "Chanel No. 5" — descriptions vary from cilantro to rotting almonds to bad fruit. Either way, it's an unpleasant, sightly sweet smell that stink bugs release when disturbed, threatened or squashed — which means it's in your best interest to find another way to deal with them instead of grabbing the nearest heavy-soled shoe.

In agricultural settings, farmers use insecticide-treated netting or predatory insects to control the stink bug population. For homeowners, your best bet is keeping them from getting inside in the first place. Jentsch recommends doing some serious caulking and screening before cold weather hits (especially in older homes, which may be less airtight than newer models) and having an exterminator give the exterior a preventative spray for those moving into new properties.

If you do spot them in your home, resist the urge to smash or vacuum the critters, which will unleash the icky stench! Instead, make a DIY booby trap by cutting the funnel-shaped top off a plastic soda bottle, inverting it and using tape to secure it to the bottle's sides to use it as a capture device. Once the stink bugs are inside, you can place the bottle in the freezer (which will kill them within an hour) or simply flush the bugs down the toilet.

You can even become a citizen scientist to help Cornell researchers study BMSB populations, and commission your very own parasitic Asian wasp to guard your yard. They've been shown to reduce stink bug populations by up to 50 percent.

Or, you know, try the soda bottle thing. Up to you.

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