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Pesky ants found in Hawaii demonstrate invasive characteristics

WEST LAFAYETTE, Ind. - A common pest in the mainland United States known for its tropical smell now has a tropical habitat to go along with it.

Odorous house ants - so called because they tend to invade houses and smell like coconut when smashed - have found their way to Hawaii. And, according to Purdue University entomologist Grzegorz Buczkowski, it doesn't seem as though they have plans to end their vacations.

"Odorous house ants in Hawaii are not like they are here in natural areas where they live in small colonies. They are creating megacolonies like they do in urban areas," said Buczkowski, whose findings were published in the journal Myrmecological News. "We went there to eliminate the ants, but we found it's too late to treat for them."

In the continental United States, odorous house ants are especially troublesome because they are difficult to remove, Buczkowski said. A nest might be eliminated at one house, but other nests could be in nearby yards, allowing the ants to come back.

"It's one of the worst, if not the worst, pest species in homes," Buczkowski said.

Buczkowski said it's too soon to know what the effect of odorous house ants will be on Hawaii's native plant and animal species, but he wants to monitor the ecosystem around their nests.

Of concern is how the ants might react to Hawaii's climate. On the mainland, odorous house ants go dormant in winter, but with Hawaii's favorable year-round temperatures, the ants could continue to eat and expand much faster than in their native range.

In natural settings, odorous house ants live about 50 to a colony with one queen, often taking up residence in acorns or other small spaces. But Buczkowski's previous research has shown that when odorous house ants move into urban areas, colony sizes explode. On the Purdue campus, for example, Buczkowski has found a colony with 5 million workers and about 25,000 queens.

In Maui, the a

Contact: Brian Wallheimer
Purdue University

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Pesky ants found in Hawaii demonstrate invasive characteristics
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