
Earth to Osaka…
When we previously visited the 2025 Osaka-Kansai Expo, we addressed a number of common complaints and criticisms that were floating around the Internet, but a new one emerged only recently: “It’s full of bugs!”
▼ A news report on the bugs.
I had encountered the bugs when I went. They were tiny things that look a little like really small mosquitoes but never landed on people, let alone bit anyone. They just kind of hovered over everyone’s heads in swarms like aphids. I only encountered them on the upper deck of the Grand Ring on the side that goes partly into the ocean, and only around sunset.
They were kind of creepy and unpleasant, but fairly mild compared with what you’d run into in a field or along a river. At the time, I was willing to give it the benefit of the doubt as one of those seasonal things like mayflies that run their course in a week or so.
▼ At first glance, you might think those specks in this photo taken from the Grand Ring are birds flying in the distance, but they’re really flies about a foot away from me.
Turns out I was wrong, and the Expo venue is now increasingly flooded with these little insects that have been identified as chironomids, more casually known as “non-biting midges” and even more casually known as “blind mosquitoes”, “lake flies”, “muckleheads”, “muffleheads”, “chizzywinks”, and other names, depending on the region.
According to reports, they are now seen in large numbers in lower parts of the Grand Ring and even near pavilions on the water side. Complaints about them have been coming in fast and furiously on social media.
▼ Yeah… they definitely weren’t this bad when I was there.
「閲覧注意」
— 市 (@0XXX0000) May 21, 2025
大屋根リングの虫まみれも酷いけど、コンビニ?内にまで虫が入ってるのとか、ヤバ過ぎる、、、#万博#万博ヤバイ#万博虫まみれ pic.twitter.com/ftRzCBjCNT
In response to this, Osaka Prefecture governor Hirofumi Yoshimura announced on 21 May that the prefecture has put in a request with Earth Chemical, Japan’s leading producer of pesticides… excuse me, “insect care products.” Yoshimura said he spoke directly with the president of Earth and that he is confident the knowledge they have gained in their vast experience would be put to good use here.
Among the typical cynicism found in online comments about the Expo, some readers of news wondered why Tokyo-based Earth Chemical was called in instead of the hometown insecticide producers at Kincho. Others wondered if a mass extermination is really in the spirit of the Expo.
“There must be some reason behind them asking Earth instead of Kincho, which is headquartered in Osaka.”
“Well, Earth was founded in Osaka and moved to Tokyo during the bubble era.”
“Sounds like the Expo’s theme has changed from ‘making life shine’ to ‘harvesting life.'”
“Sounds like the Expo’s going even deeper into the red paying for this.”
“I heard the chironomid season is until mid-July, so they better act fast or just wait it out.”
“The bugs were pretty bad near the water show.”
“Tropical fish or medaka would happily eat the larvae of those insects.”
“Poor flies… They’re not hurting anyone and die in a few days anyway. Why kill them just because they multiply in large numbers and are unpleasant?”
I tend to agree with that last comment in that, compared to most insects I’ve encountered throughout my life, those bugs are rather innocuous. And unless they’ve gotten bolder in recent days, they tend to just keep to themselves, albeit only a couple inches from people’s heads.
Also, I think if you’re going to build an enormous wooden structure as a symbol of humanity’s harmony with nature, you really should expect insects to be a part of that harmony too. Call me crazy, but launching a chemical attack on them feels a little out of step with that theme. At least using medaka to eat them has a certain circle-of-life quality to it.
Source: YTV News NNN. Hachima Kiko
Photos ©SoraNews24
● Want to hear about SoraNews24’s latest articles as soon as they’re published? Follow us on Facebook and Twitter!


Attendees to Expo 2025 hit record numbers despite record numbers of bugs
Osaka Expo expected to turn an operating profit of over 23 billion yen
Osaka governor suggests lowering voting age to 0 to curb population decline
Anti-insect laser gun turrets designed by Osaka University, expected to work on roaches too
Fatal flop or fun? What is the 2025 World Expo in Osaka really like?
Japan’s instant ramen snack theme park features an athletic course even adults can enjoy
Tokyo’s new extra-expensive ramen restaurant is dividing opinions, so we tried a bowl
Pizza Hut Japan’s drinkable curry pizza is here – Is it all we dreamed it would be?[Taste test]
Japanese temple burns to the ground, fire burning inside for 1,200 years unharmed
Krispy Kreme Japan is bringing two special donuts to the most-forgotten big city in the country
Bizarre Japanese vending machine sells “Peace and Equality” and “Angels and Demons”
Gundam teams up with 300-year-old daruma maker for wood-carved anime mecha figures[Photos]
Starbucks Japan hoping fans will go bananas for its new mottainai banana affogato Frappuccino
Japan has a new cute and clever sunblock for cat lovers
Kanji ice cream becomes a sell-out hit in Japan
Tokyo’s life-size Gundam anime mecha statue will be removed this summer
This Tokyo Station sweets sensation sells out daily, but we finally got our hands on it
Japan’s izakaya pubs closing at record pace, failing to attract foreign tourists
Ichiraku Ramen-inspired ramen sets from Naruto anime pay homage to Naruto, Sasuke, and Sakura
The story of our reporter P.K. Sanjun’s heart attack
The average age of Japan’s hikikomori shut-ins is getting older, survey shows
Japan enters Golden Week vacation period, survey shows one in three plan to ride it out at home
New Kyoto Converse sneakers celebrate Japan with traditional kimono fabrics for your feet
Japan’s new Pokémon jackets give you the look and powers of the Kanto starter trio
Japan now has gyoza doughnuts, and they taste like no other doughnut we’ve tried before
Tifa’s Final Fantasy VII bar is going to pop up in real-world Tokyo
Japan’s 5.3 million beautiful Hitachi Nemophila flowers are now in full bloom[Photos]
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
We deeply regret going into this tunnel on our walk in the mountains of Japan
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
No more using real katana for tourism activities, Japan’s National Police Agency says
Japan reportedly adding Japanese language skill requirement to most common foreigner work visa
The Sushiro of the future to open at the Osaka-Kansai Expo 2025
Lock that opens when Osaka dialect is spoken unveiled at Expo 2025
Pocky maker Glico talk about their cellular regeneration breakthrough and new candy at Expo 2025
On-site coverage of the 2025 Osaka-Kansai Expo from our reporter’s mother