The Northeastern region of the United States has faced its fair share of natural phenomena lately, from spotted lanternflies to cicadas. Now, residents must brace themselves for yet another unexpected invasion—giant venomous spiders with 4-inch-long legs that can “parachute” through the air, according to CBS News [1].
New Jersey Pest Control recently issued a warning about the impending arrival of these spiders. Known as Joro spiders, they are hard to miss due to their vibrant yellow and grey bodies, and females can have a leg span of up to 4 inches. What truly sets them apart, however, is their ability to “fly” – a rare trait among spiders. By using a technique called ballooning, Joro spiders release silk threads into the air, allowing themselves to be carried by the wind.
Although these spiders have yet to reach New York and New Jersey, experts are confident that it is only a matter of time. José R. Ramírez-Garofalo, an ecologist at Rutgers University’s Lockwood Lab, and president of Protectors of Pine Oak Woods on Staten Island, emphasized the inevitability of their arrival in the region.
In a peer-reviewed study published in October, invasive species expert David Coyle indicated that the Joro spiders are “here to stay.” Originally native to Asia, they were introduced to northern Georgia around 2010, and their spread has since continued. While experts have been warning about their potential arrival in New York since 2022, no sightings have been confirmed yet.
Coyle explained that these spiders are likely to inhabit most of the eastern U.S., matching well with their comfort zone in their native range. Consequently, individuals who are uneasy around creepy crawlies may find this invasion particularly discomforting.
Reports from across the eastern U.S. have documented Joro spiders in states such as Florida, Alabama, Mississippi, the Carolinas, Tennessee, Kentucky, Virginia, West Virginia, Maryland, and Ohio. According to Andy Davis, a researcher at the University of Georgia, New York happens to be located right in the middle of their preferred habitat. Davis suggests that these spiders could start popping up across New York and neighboring states as summer progresses.
Surprisingly, these arachnids have shown adaptability to urban environments. Davis observed Joro spiders on street lamps and telephone poles, places where “regular spiders wouldn’t be caught dead in.”
While Joro spiders are venomous, Coyle assures that they pose no direct danger to humans. The venom is primarily used to subdue their prey, which includes butterflies, wasps, and cockroaches. However, they could potentially threaten native spider populations.
“There is no evidence that they’ve caused harm to humans or pets,” Coyle emphasized.
As the Northeast prepares for the arrival of these giant venomous spiders, residents can rest assured that they pose minimal risk to their safety. However, precautions may be necessary to protect the local ecosystem and ensure the balance of native species remains intact.