Are Joro Spiders Venomous? Tips for Dealing with These Invasive Creatures

Are Joro Spiders Venomous? Although their size and appearance may give the impression that Joro spiders are menacing, they lack aggression and are unlikely to inflict damage unless provoked.

In East Asia, the Jojo spider, scientifically known as Trichonephila clavata, is a large arthropod. They can reach leg spans of 4-5 inches (10–12 centimeters) at maximum and have conspicuous yellow markings on their undersides.

Certain geographical areas, such as portions of the southeastern United States, classify them as invasive species. Their introduction probably occurred via trade or transportation.

Joro spiders, like most spiders, have venom, but it is not considered toxic to humans. Sensitive individuals may experience mild allergic reactions or localized discomfort from their bite, but it is generally not harmful.

The University of Georgia’s research found that Joro spiders—known for being the most numerous in the country—have impressively well-adapted to urban environments.

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According to co-author Alexa Schultz, a third-year ecology student at the University of Georgia, Joro spiders won’t hesitate to build a web beneath a stoplight. “It remains to be seen how people will react, but I believe the spiders will remain.”

Approaches when confronted with a Joro Spider

• Cultivate prudence and refrain from unnecessarily disturbing a Joro spider or any other spider that you may encounter.
• Maintain a safe distance; avoid disturbing or provoking the arachnid. Allow it some distance and refrain from approaching it too closely.
• Do not touch the spider with your bare palms or any other object. This minimizes the likelihood of inadvertent bites or instilling a sense of threat in the arachnid.
• Generally, it is best to leave a spider outside that does not present an imminent threat unattended. Spiders control insect populations and perform vital functions within ecosystems.
• If indoors: If the spider is indoors, release it outside, away from the home, after carefully capturing it with a piece of paper and glass.
• If the species of spider is unknown or if the infestation is substantial, it is advisable to consult a pest control specialist.