Creepy Giant Invasive Spider, Joro, Likely to Spread to Tri-State Area This Summer

Arachnophobes beware, a massive invasive spider known as the Joro spider is expected to make its way to the tri-state area this summer. Initially native to East Asia, the yellow and black Joro spiders have started proliferating in the southeastern United States, particularly in Georgia.

An academic study conducted by Clemson University in Fall 2023 confirmed that the Joro spider is now a permanent resident in the U.S., with a rapid expansion seen across several states including South Carolina, North Carolina, Tennessee, and Georgia, where they were first discovered. Reports have also surfaced of Joro spiders in other states like Alabama, Maryland, Oklahoma, and West Virginia.

The spreading pattern, fueled by their «ballooning» ability that enables them to travel through air currents, indicates that the Joro spiders are likely to make further inroads along the East Coast, potentially including Pennsylvania, New Jersey, and Delaware.

The Joro spider, scientifically known as Trichonephila clavata, is characterized by its large size, with females having bodies measuring up to 1 inch and legs spanning up to 4 inches. Although their appearance may be intimidating, these arachnids are relatively harmless to humans and pets.

Despite the likelihood of the Joro spider venturing northwards, it is not a cause for imminent concern. Penn State Extension research indicates that while the spiders could reach Pennsylvania and possibly beyond over the years, the immediate risk of their appearance is minimal.

Officials from Pennsylvania, New Jersey, and Delaware are monitoring the situation closely but have not officially reported any sightings in their respective states. Dr. Doug Tallamy, a Delaware entomologist, downplayed the potential invasion as a low-priority issue.

The specimens are believed to have entered the U.S. via shipping containers, and they belong to the family of orb-weavers known for spinning large, circular webs. Their remarkable ballooning technique aids in their widespread dispersal, driven primarily by natural mechanisms as well as potential human-mediated transport.

Despite their frightening appearance, the Joro spiders are relatively benign and pose minimal threats to humans. A research paper from the University of Georgia revealed that these spiders are often wary of human interaction and are unlikely to bite. They primarily feed on insects like mosquitoes, stink bugs, and even spotted lanternflies.

While the presence of Joro spiders has sparked concerns about displacement of local species and negative ecological impacts, the full extent of the consequences remains unclear. Researchers emphasize that the spiders, though voracious, play a role in natural pest control.