Asian Needle Ants Spread to Over 20 US States Since 1932 Introduction

Asian needle ants, originating from temperate regions of East Asia, were first detected in Georgia and North Carolina in 1932. U.S. Forest Service, the species has since spread to more than 20 states. The ants are known for their venomous stings, which can lead to serious allergic reactions.

In 2024, at least three cases of life-threatening anaphylactic reactions were reported in Georgia. Anaphylaxis from the sting can cause rapid heartbeat, breathing difficulties, and throat swelling. U.S. Forest Service.

needle ants have been documented in more than 20 states, primarily in the Southeast and parts of the Mid-Atlantic.

Notable increases have occurred in Tennessee, Virginia, Kentucky, New York, and Wisconsin, with additional reports from Texas. The ants resemble other common ant species, making identification challenging.

Their long, thin bodies and stinger size, reflected in their Japanese name meaning 'giant needle ant,' distinguish them, per the Virginia Cooperative Extension. Unlike fire ants, they do not form visible foraging trails or large mounds.

native habitats, Asian needle ants outcompete other ant species important to local ecosystems, according to the University of Georgia.

They build nests in damp wood, such as wet mulch or fallen logs. The ants are not typically aggressive but can pose risks to humans and pets through stings. Andrew Johnston, an insect diagnostician at Purdue University's Department of Entomology, stated that the ants do not swarm like fire ants.

He recommended wearing gloves and being cautious when handling objects outdoors. Benoit Guénard, a professor of ecology and entomology at the University of Hong Kong, described the sting as causing sharp, acute pain localized to the area. He based this on studies of the ants in North Carolina.

formalized management recommendations exist for Asian needle ants.

Protein-based pesticide baits appear effective, according to North Carolina State University. These baits may suppress colonies rather than eliminate them entirely. To use baits, establish treatment zones around homes and follow manufacturer instructions.

Monitor bait stations for ant activity over the next three to four weeks. Preventive measures include maintaining dry conditions around structures to deter nesting.