Scientists in US, Canada gear up for battle against murder hornets

Scientists in the U.S. and Canada are opening new fronts in the war against so-called murder hornets as the giant insects begin establishing nests this spring.

The scientists said Wednesday that the battle to prevent the apex predators from establishing a foothold in North America is being fought mostly in Whatcom County, Washington, and the nearby Fraser Valley of British Columbia, where the hornets have been spotted in recent years.

"This is not a species we want to tolerate here in the United States," said Sven-Erik Spichiger of the Washington state Department of Agriculture, which eradicated a nest of the Asian giant hornets last year. "The Asian giant hornet is not supposed to be here."

"We may not get them all, but we will get as many as we can," he said of eradication efforts this year.

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Paul van Westendorp of the British Columbia Ministry of Agriculture, Food and Fisheries said the hornets pose threats to human life, to valuable bee populations needed to pollinate crops and to other insects.

"It’s an absolutely serious danger to our health and well-being," he said. "These are intimidating insects."

One major front will be setting thousands of traps this spring to capture queens that are trying to establish nests, officials said. Both government agencies and private citizens will set traps, they said.

Two live Asian giant hornet queens were discovered inside a Whatcom County, Washington nest inside a tree. Video footage from Washington State Department of Agriculture.

Another effort is underway to determine exactly where in Asia these hornets came from, to try and learn how they are getting across the Pacific Ocean, scientists said. The theory is they are crossing on cargo ships, Spichiger said.

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While hundreds of the hornets were killed when the nest in Whatcom County was destroyed last October, only a handful of the hornets were spotted in British Columbia last year, van Westendorp said.

Scientists have been studying the genetics of captured hornets and comparing them with those that exist in South Korea, Japan and China, Spichiger said.

Initial findings indicate the hornets found in the U.S. were linked to hornets in South Korea, while those in British Columbia were linked to hornets found in Japan, Spichiger said.

But it is not clear that the hornets found in North America actually migrated directly from those countries, said Anne LeBrun, a scientist for the U.S. Department of Agriculture. The agency is working to pin down the origin of murder hornets found here.

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Hornet queens tend to emerge from winter quarters in the spring and establish nests to birth worker hornets. The hornets start attacking and destroying beneficial honey bees later in the year, eating the bees for protein as they raise more hornets, Soichiger said.

Whatcom County is about 55 miles (88 kilometers) south of Vancouver, British Columbia.

The Asian giant hornet found near the Canadian border earlier this month. Its enormous size and yellow head are unique to this invasive species.

The Washington state agency will continue using orange juice and rice cooking wine in traps this year, while citizens can use either orange juice or a brown sugar-based bait, officials said. Residents in Whatcom, Skagit, San Juan, Island, Jefferson, and Clallam counties in Washington have been encouraged to make their own traps starting in July.

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