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The Most Destructive Termite Species In The Western US May Be Displaced By A New Invasive Species Of Termite


There exists several termite species in the United States that are categorized as “pests to structures.” The most destructive and economically costly termite species in the United States is the eastern subterranean termite. Given the common name of this species, it should not be surprising to learn that eastern subterranean termite colonies become less prevalent in the west. As you may be able to guess, the most destructive termite species within the western coastal states is the western subterranean termite, at least this is what researchers believed until a new termite species was identified as inhabiting the western coast of North America several years ago. This new species is known as Reticulitermes okanaganensis, and while this species has been known as a pest to structures in British Columbia, researchers have only recently learned that this species infests structures ranging across the entirety of the western U.S. coast.

The Reticulitermes okanaganensis termite species is now known to exist within the states of California, Oregon, Washington, Idaho and Nevada. This species has been causing extensive damage to structures in British Columbia for years, but the species was not identified as Reticulitermes okanaganensis until the early 2000s. The damage these termites have been inflicting upon structures in British Columbia is unprecedented in the relatively cold region where most termite species would not be able to survive. When these attacks were at their height in Canada, pest control professionals reported difficulties in eradicating Reticulitermes species from structures in northern California. Now it is believed that Reticulitermes okanaganensis was responsible for many of these infestations, but they could not be easily eradicated as insecticides are not designed to address the unique physiology of this new termite species. Also, much of the structural damage in California that has long been attributed to western subterranean termites may have also been caused by Reticulitermes okanaganensis pest activity. Studies that aim to map this species’ distribution within the US are ongoing.

Do you believe that there exists more termite pest species in the US than researchers are currently aware?


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