Termites leftover from orchard past use underground tunnels to get into walls.
Orchards in the Silicon Valley were eventually cut down to give way to neighborhoods and some theorize that these left=behind orchards have provided termite havens, much to the chagrin of homeowners.
Several pest management professionals have told NBC Bay Area that homes now sitting on land that was once part of an orchard, are susceptible to subterranean termites. The orchards were eventually cut down to give way to neighborhoods now known as Evergreen, Blossom Valley, and others. But something that stayed behind in the roots of those trees is now stumping homeowners: subterranean termites.
“Once they’re done eating the root systems, they can make tunnels and go right up your walls from the ground and get to your wood underneath the structure,” said Larry Bragg, an inspector with Clark Pest Control
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Source: NBC Bay Area