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Hawaii: Invasive long-horned beetle from Australia attacks Puna crops

An invasive new pest is starting to spread in Hawaii, and agriculture experts say it’s attacking crops in some areas of the Big Island. There is no common name for Acalolepta aesthetica, which has been dubbed the Queensland Longhorn Beetle, a reference to its native habitat in that region of Australia. The beetle is already damaging different trees, including cacao, citrus, breadfruit and kukui. According to, the bug is not considered a pest in Australia.

“This is a huge concern because this is diversified agriculture that’s so important to our economy,” said Franny Brewer, communications director for the Big Island Invasive Species Committee.

Adult beetles will chew the bark and then lay eggs in the trees. Larvae cause damage when they feed and tunnel within the branches and trunk.

“Once that larvae is inside of the tree, there’s no known control method besides cutting that tree down and burning it or bagging it in a way that the adults can’t escape,” explained Brewer.

A researcher in Hilo hopes to test commercial lures this summer to see which are the most effective for capturing and trapping the beetles. She also plans to use the insects for genetic work.

“It’s kind of boggling to me that there’s not that much in the scientific literature and so if people brought us beetles, that would be great,” said Sheina Sim, a research biologist for the United States Department of Agriculture’s Agricultural Research Service.

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