12 Facts About the Brown Marmorated Stink Bug

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iStock.com/claudiodivizia

There are about 5000 species of stink bugs, shield-shaped insects that belong to the family Pentatomidae. One of the most notorious stink bugs is the brown marmorated stink bug (Halyomorpha halys Stål), a.k.a. BMSB, which The New Yorker called “the most destructive, the most annoying, and possibly the ugliest” of all the stink bugs, an invasive species that’s taking North America by storm … and not in a good way. Here’s what you should know.

1. IT MADE ITS WESTERN HEMISPHERE DEBUT IN PENNSYLVANIA.

A stink bug
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Native to East Asia, the first BMSB specimens in the U.S. were collected in Allentown, Pennsylvania in 1998, but the bugs likely arrived a few years prior to that. (They may have come to the states in a shipping container, but no one’s sure.) Since then, they’ve spread to 43 states and will probably be continent-wide soon.

“It’s an incredible hitchhiker,” Dr. Tracy Leskey, an entomologist with the Agriculture Department’s Appalachian Fruit Research Laboratory, told The New York Times of the BMSB. Less than 10 years after it was identified in the States, it was in Switzerland and other parts of Europe, too.

2. IT TOOK YEARS TO IDENTIFY IT.

A magnifying glass on a yellow background.
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When the bugs were delivered to Karen Bernhard, an entomologist at Pennsylvania State University’s Extension Service, she had no idea what they were—and neither did anyone else. (Many assumed it was the native Euschistus servus.) It wasn’t until 2001, when Bernhard sent specimens to Richard Hoebeke, an entomologist specializing in invasive species who was then working at Cornell, that they were identified as brown marmorated stink bugs.

3. IT’S NOT CUTE.

Brown marmorated stink bug eggs hatching on a leaf.
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After they hatch, the black-and-red nymphs go through five molts, growing into mottled, dull-brown bugs—up to .66 inches long—with white banded antennae and legs, alternating dark and light bands on the abdomen, and smooth, rounded shoulders. All of these features distinguish them from lookalikes like the brown, rough, and one-spotted stink bugs. BMSBs can live for up to eight months.

4. THEIR SPRAY HAS SOMETHING IN COMMON WITH CILANTRO.

A bunch of cilantro tied together with a string
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Skunk. Old socks. Coriander. These are just some of the things the stink of the brown marmorated stink bug has been compared to. The two main chemicals responsible for the BMSB’s stinky spray are trans-2-octenal and trans-2-decenal. The latter is what gives cilantro its smell.

The chemicals in the spray might have a purpose besides scaring away predators: According to a 2016 study, they “inhibit the growth of bacteria”; the results of the study “suggest that brown marmorated stink bug aldehydes are indeed antibacterial agents and serve a multifunctional role for this insect.”

5. THEY EAT YOUR APPLES …

Brown marmorated stink bug feeding on an apple
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Brown marmorated stink bugs chow down on more than 100 types of crops. According to StopBMSB.org, apples, Asian pears, green beans, sweet corn, peaches, tomatoes, peppers, and Swiss chard are among the crops BMSBs pose the most risk to. Apricots, blueberries, broccoli, cauliflower, sweet potatoes, and turnips are also on the menu (though they’re less at risk).

To feed, the bugs pierce the skin of the plants with their mouthparts and drink the fluids, which in fruits like apples “results in a characteristic distortion referred to as ‘cat facing,’ that renders the fruit unmarketable as a fresh product,” according to a Penn State Extension article on the bugs. In 2010, mid-Atlantic farmers estimated that BMSBs caused $37 million in damage to apple crops alone. Some farmers of apples and other crops reported total losses that year.  

6. … AND COULD INVADE YOUR HOME BY THE THOUSANDS.

A stink bug on a model of white house
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Come winter, BMSBs are looking for a warm place to shack up so they can enter diapause, a hibernation-like state that lasts until spring (a.k.a. mating season). Outdoors, they’ll overwinter in dead trees—but often, they find their way into peoples' homes through open windows and doorways, in the gaps around window air conditioning units, down chimneys, and basically any crack they can find.

According to The New Yorker, “Studies have shown that, despite their relative heft, stink bugs can crawl through any crevice larger than 7 millimeters, which means that, no matter how much caulk and weather-stripping and patience you possess, it is virtually impossible to stink bug-proof a home.” But that doesn’t mean you shouldn’t try; experts recommend placing screens over windows and vents and making liberal use of caulk to patch cracks.

Once a stink bug has found a warm spot it likes, it will release an aggregation pheromone (which can linger for up to a year) that draws other BMSBs to the same area, where they’ll gather in sometimes staggering numbers: One study found more than 26,000 of them living in a Maryland home.

The good news is, beyond being a smelly nuisance, they won’t mate in your home or cause structural damage (though they might clog chimneys ... or your pipes).

7. ONCE INSIDE, THEY’RE HARD TO GET RID OF.

A stink bug on a piece of wood.
iStock.com/drnadig

Some suggested stink bug removal approaches include knocking the bugs into soapy water, placing fly traps or double-sided tape in entryways, and spraying various concoctions (like garlic water) around your house. Vacuuming them up is also an option, though as the Penn State Extension article notes, “the vacuum may acquire the smell of stink bugs for a period of time,” so it might be best to avoid that tactic if your vacuum doesn’t have a bag you can easily toss.

A study showed that traps baited with the aggregation pheromone are only effective half of the year. And though foggers will kill stink bugs around your house, “it will not prevent more of the insects from emerging shortly after the room is aerated” and therefore “is not considered a good solution to long-term management of the problem.” Even expensive professional extermination efforts can be for naught.

Research by Virginia Tech has suggested that the most effective method of removal is to line a roasting pan with foil, fill it with soapy water, and place it in a dark room with a light above it to attract the bugs. According to a press release, this method—which was tested in 16 homes over a period of two years—“eliminated 14 times more stink bugs than store-bought traps that cost up to $50.”

8. THEY’RE PRETTY GREAT FLIERS.

In the home, stink bugs are lethargic, buzzing around clumsily thanks to diapause. But in the wild, they’re good fliers: Research has shown that, in flight mill tests, the bugs can fly 1.2 miles in a 24-hour period, and in field observations, they fly in a straight line at 6.7 mph. You can see one flying in slow motion here.

9. THEY’RE GENERALLY NOT HARMFUL.

A puppy with a leash in its mouth.
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BMSBs don’t sting or bite—their main defensive mechanism is their stinky spray. But some people can have allergic reactions, including rhinitis, conjunctivitis, or dermatitis, to the spray. The bugs aren’t toxic, so they won’t hurt your pets—though the chemicals in their spray might make your pets vomit or drool.

10. THEY MIGHT BE MESSING WITH YOUR RED WINE.

Pouring red wine into a glass.
iStock.com/debyaho

Not only do these pests feed on grapes, but they can end up in the mix as grapes are turned into wine, where the bugs give off stress compounds that affect the quality of the vino. Researchers at Oregon State University placed live and dead stink bugs on wine grapes and measured the stress compounds the insects released as they and the grapes were squeezed during the winemaking process. According to a press release, “They found that pressing was a key step in the release of two of the most common stress compounds—tridecane, which is odorless, and (E)-2-decenal, which produces an undesirable musty-like, coriander or cilantro aroma.” Red wine was more affected than white, maybe because the grapes are pressed at different points in the production process. The researchers found that more than three stink bugs per grape cluster resulted in contaminated wine.

11. THEY LEAVE TRACES OF THEIR PRESENCE ON PLANTS.

Brown marmorated stink bug on a plant.
iStock.com/ibunt

Scientists at Rutgers University recently discovered that they could detect the eDNA (or environmental DNA—things like skin flakes, scales, exoskeletons, or fecal matter) of brown marmorated stink bugs in the water farmers used to wash their produce before the crops go to market. They visited two farms—one in New Jersey with a known stink bug infestation and another that was just outside the bugs’ range in New Hampshire—where they both tested water and set traps for the bugs. As expected, they found stink bug DNA at the Jersey farm … and they found it at the New Hampshire farm, too. There, on the last day of testing, an immature stink bug ended up in a trap—visual confirmation of what their data was telling them. They hope that farmers can use the test to detect stink bugs before there’s a full-fledged infestation.

12. ONE OF ITS NATURAL PREDATORS IS A PARASITIC WASP THAT JUST MADE ITS WAY TO THE STATES.

A samurai wasp lays an egg in a brown marmorated stink bug egg
Oregon State University, Wikimedia Commons // CC BY-SA 2.0

In the U.S. the BMSB has few predators—so when scientists were looking for a way to combat the pests, they went to Asia. There, the stink bugs are kept in check by samurai wasps (Trissolcus japonicus), a tiny, stingerless parasite that lays its eggs in the stink bugs’ eggs, where its larvae eat the contents before emerging as wasps to continue the cycle. Sixty to 90 percent of BMSB eggs in Asia are parasitized by the wasps.

Scientists brought some of the wasps back and began testing to see if they would be a good candidate for release in the states. But before they could release any, the wasps showed up on their own, in Maryland in 2014. (Genetic testing showed that they weren’t escaped wasps that the scientists had been studying.) According to Science, “Although in laboratory tests it has parasitized some eggs laid by native species, [the wasp] has shown a strong preference for brown marmorated stink bug eggs.” Still, scientists are proceeding with caution: Though they can release the wasps in states where they’ve already been found, there are rules and regulations to follow and permissions to get before they can be released anywhere new.

Massive Swarms of Migrating Dragonflies Are So Large They’re Popping Up on Weather Radar

emprised/iStock via Getty Images
emprised/iStock via Getty Images

What do Virginia, Pennsylvania, Indiana, and Ohio all have in common? Epic swarms of dragonflies, among other things.

WSLS-TV reports that this week, weather radar registered what might first appear to be late summer rain showers. Instead, the green blotches turned out to be swarms of dragonflies—possibly green darners, a type of dragonfly that migrates south during the fall.

Norman Johnson, a professor of entomology at The Ohio State University, told CNN that although these swarms happen occasionally, they’re definitely not a regular occurrence. He thinks the dragonflies, which usually prefer to travel alone, may form packs based on certain weather conditions. If that sounds vague, it’s because it is: Johnson said that entomologists haven’t worked out all the details when it comes to dragonfly migration. They do know that the airborne insects cover an average of eight miles per day, while some overachievers can fly as far as 86.

Based on the radar footage shared by the National Weather Service’s Cleveland Office, the dragonfly clouds seem almost menacing. But, while swarms of any insect species aren’t exactly delightful, these creatures are both harmless and surprisingly beautiful, at least up close. Anna Barnett, a resident of Jeromesville, Ohio, even told CNN that witnessing the natural phenomenon was “amazing!”

Amazing as it may be to see, it’s hard to hear news about unpredictable animal behavior without wondering if it’s related in some way to Earth’s rising temperatures. After all, climate change has already affected wasps in Alabama, polar bears in Russia, and no doubt countless other animal species around the world.

[h/t WSLW-TV]

6 Fall Festivals Around the World That Celebrate Animals

Prakash Mathema, AFP/Getty Images
Prakash Mathema, AFP/Getty Images

Where would humans be without animals? Chickens and cows give us eggs and milk, providing nourishment (and also cake). Horses, donkeys, and water buffalo are as hardworking as any person, and thanks to our pets, we always have a source of love and entertainment to come home to. It's time we celebrate animals more often, and to get you started, here are six fall festivals around the world that do just that.

1. Kukur Tihar

Dog in Nepal during a fall festival
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A big part of Tihar, a five-day Hindu festival held in late autumn in Nepal, is giving thanks to other species. Crows, believed to be the messengers of death, are worshipped on the first day. Cows are worshipped on the third, and often oxen on the fourth. The second day, though, is all about man's best friend. Dogs are described favorably in Hindu religious texts, and it’s believed that they can warn people of impending danger and even death. In a ceremony called Kukur Tihar, people place flower garlands around the necks of both pet dogs and stray dogs to show their respect. A red dot (tika) is placed on their foreheads in an act of worship, and naturally, the dogs are spoiled with lots and lots of treats.

2. Transhumance Festival

Hundreds of sheep in the street
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In Spanish, this festival in Madrid is called Fiesta de la Trashumancia. The word transhumance refers to the act of moving herds of livestock to different grazing grounds depending on the season. In practice, it's quite the spectacle. Thousands of sheep have been led through the streets of Madrid each autumn since the festival was formally established in 1994. Men and women in traditional garb lead the way, singing and dancing along the parade route in celebration of centuries-old shepherding traditions.

3. Monkey Buffet Festival

A monkey eating various kinds of fruit
Saeed Khan, AFP/Getty Images

Visitors to Thailand’s temples are advised not to feed the monkeys (they can get awfully handsy), but the locals of Lopburi make an exception on the last Sunday of November. On this day, towers of fruit and banquet tables containing several tons of food and even cans of Coca-Cola are set up in the ruins of a 13th-century temple. Once a sheet is removed to unveil the spread, it doesn’t take long for Lopburi’s thousands of macaques to arrive. Thailand's reverence for monkeys dates back some 2000 years to legends surrounding the monkey king Hanuman and his heroic feats. Nowadays, the creatures are considered a sign of good luck in the country.

4. Woolly Worm Festival

The woolly worm is to Banner Elk, North Carolina, what the groundhog is to Punxsutawney, Pennsylvania. According to local folklore, the color of this fuzzy caterpillar can be analyzed in autumn to predict how severe the forthcoming winter will be. The 13 segments on its body are thought to correspond to the 13 weeks of winter—more black means colder weather and snow, while more brown means the weather will be fair. To make this prognostication process more official, the Woolly Worm Festival was established on the third weekend of October in 1978. This year, it will be held October 20-21. A worm race is the main event, and the caterpillar that climbs the fastest up three feet of string gets the honor of helping to predict the winter (plus a $1000 cash prize for the worm’s coach). “Patsy Climb” and “Dale Wormhardt” were a couple of past competitors.

5. Pushkar Camel Fair

Decorated camels
Roberto Schmidt, AFP/Getty Images

The Indian state of Rajasthan is a vibrant place. It’s home to the Pink City, Blue City, and Yellow City, and it also hosts a colorful cultural event each November called the Pushkar Camel Fair. Celebrated on a full moon day of the Hindu lunar calendar, it’s one of the largest fairs of its kind in the world. The annual gathering is a chance for traders to show off their camels and livestock, while also celebrating local culture and traditions. Both the people and camels sport brilliant attire, participate in a variety of competitions, and dance to lively music. (Yes, there’s video evidence of a dancing camel, but the word dance is used loosely.)

6. Birds of Chile Festival

Held each fall in Viña del Mar along Chile's Pacific coast, the Festival de Aves de Chile celebrates the beauty and diversity of the country's birds. Festival-goers have the chance to see Chile’s national bird—the wide-winged Andean condor, which happens to be one of the largest flying birds in the world—as well as other feathered friends in their natural environment. A series of excursions and talks featuring bird experts are organized each year.

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