Deadly Asian Needle Ants Found in US
June 14, 2025 by David Jones
The U.S. Forestry Service has reported the presence of Asian needle ants in Florida, particularly in areas near Tallahassee and along the state’s east coast. This has sparked concerns due to the potential health risks associated with these ants. The sting of an Asian needle ant can trigger a severe allergic reaction, anaphylaxis, which can be life-threatening. The risk is even higher for individuals with allergies to certain foods or bee stings. It is recommended that anyone experiencing a reaction to a sting seek immediate medical attention.
Dr. Debbie Castle, an ant behavior biologist at the University of South Florida, has provided some insight into the behavior of these ants. According to her, only the worker ants have the capacity to sting, while the queens and males do not. The sting of an Asian needle ant is similar to that of a fire ant, known for their painful bites. As a precautionary measure, individuals allergic to fire ant stings are advised to carry an EpiPen.
Asian needle ants differ from fire ants in their habitat preferences. While fire ants are commonly found in grassy areas, Asian needle ants favor forested regions abundant in decaying wood. This means they are less likely to be found in well-kept lawns. Fire ants, which were introduced to Florida in the 1920s and 1930s, have since spread worldwide, even reaching China. The arrival of Asian needle ants in Florida has raised concerns about the potential impact of another invasive species on the ecosystem.
It is believed that Asian needle ants were introduced to the U.S. through international trade, specifically in the soil of imported plants and landscaping materials. Their tendency to inhabit underground and under-rock areas allows them to travel unnoticed, leading to their unintentional spread.
Dr. Castle’s interest in ants stems from her background in psychology. She is intrigued by the similarities between ant and human social behavior. Ants display complex social structures, providing homes for their queens and young, and engaging in territorial battles. These behaviors provide insights into cooperation and resilience in challenging circumstances.
The presence of Asian needle ants in Florida serves as a reminder of the challenges posed by invasive species. Residents are advised to remain vigilant, especially in wooded areas, highlighting the importance of understanding and managing the ecological impacts of these species.