Box Elder Bugs

Sprayed Them in Fall—Now They’re Inside? Here’s What Happened

April 30, 20261 min read

A homeowner in Utah County called us in the spring - box elder bugs had taken over two rooms.

They'd tried spraying themselves the fall before. Hit the clusters on the south wall, seemed to clear them.

But what actually happened: the spray scattered them. The ones that didn't die pushed deeper into the exterior gaps. Spent the winter in the wall voids.

Come spring, they emerged inside the house instead of outside it.

DIY sprays aren't formulated for box elder bugs the way professional-grade treatments are. And when they scatter instead of die - you've made the problem worse.

We treated the exterior with a high-pressure application targeting their actual gathering spots. Problem solved for the season.

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