Asian Needle Ants Spread Across Multiple US States with Stings Causing Allergic Reactions

Asian needle ants, an invasive species from Asia, are present in multiple US states. These ants, also known as Pachycondyla chinensis, deliver stings that cause a throbbing sensation lasting over 30 minutes. Reactions can vary, with some individuals experiencing redness, itching, and swelling, while those allergic to insect venom may suffer anaphylaxis.

USA Today reported that the ants' venom is more likely to trigger allergic reactions than honey bee stings, according to North Carolina State University. 2 inches, with shiny dark brown to black bodies and orange-brown back legs and antennae. Identifying them can be difficult due to similarities with other ant species.

The ants originate from regions including China, Japan, North Korea, and South Korea.

They have been reported in Alabama, Connecticut, Florida, Georgia, New York, North Carolina, South Carolina, Tennessee, Virginia, Washington, and Wisconsin, per North Carolina State University and AntMaps. Their range may extend further, as colonies can go undetected.

Asian needle ant colonies are smaller than those of common household ants and do not form visible mounds like red imported fire ants.

They inhabit mulch, potted plants, cracks in branches, logs, railroad ties, leaf litter, potting soil, and wood chips. This adaptability allows them to thrive in urban, suburban, and forested environments.

The ants have been in the US for nearly 100 years, but their ecological effects became apparent in the last 20 years, according to the US Forest Service.

In invaded Georgia forests, the ants occupy nearly every stump, log, or branch on the forest floor. They reduce populations of native ants that disperse seeds for native plants and act as predators on other species. S.

Forest Service (USA Today) Management efforts focus on research into baits and strategies, but eradication is challenging, especially in remote areas, due to risks to beneficial species and high costs. Prevention involves caution when moving materials like wood and soil to avoid further spread. The ants are considered established and difficult to eliminate once present.