Formosans found in La Mesa


August 13, 2018

Wegner: Formosan-Subterranean-Termite

Photo: Dr. Gerald Wegner

Mike Edelen, a wood-destroying organism (WDO) inspector at Thrasher Termite & Pest Control of So Cal, Inc. in San Diego, Calif., recently discovered a new colony of Formosan subterranean termites in La Mesa, half a mile from the original 1992 outbreak of this destructive, invasive species. Conclusive identification of Coptotermes formosanus was made by Thrasher Termite & Pest Control in cooperation with the San Diego County Department of Agriculture and the California Department of Agriculture Plant Pest Diagnostics Division in Sacramento, Calif.

“It was clearly evident that these termites did not behave like native subterranean termites,” says Garrett Thrasher, owner and general manager of Thrasher Termite & Pest Control. The homeowner first noticed a potential problem when a cloud of winged insects swarmed their yard at twilight. Those winged insects turned out to be adult Formosan subterranean termites seeking mates.

“By the time we were called to the property, most of the termite reproductives were caught in spider webs, dead or had disappeared. But we found a live, robust colony in the structure of the home,” Thrasher adds. “Unlike native subterranean termites, the termites we observed were extremely active, didn’t flee when disturbed, and the soldiers went into attack mode. They had hollowed out large areas of structural wood, always staying just beneath the exterior paint and unnoticed by the homeowner. All of these behaviors, in addition to size and coloration of the reproductives, led us to suspect Formosan termites. Unhappily, we were correct.”

Formosan subterranean termites were last seen in La Mesa in 1998. It is unknown whether this population is related to the previous infestation.


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