Scientists say stink bugs have been reported in 38 states.
That's five more states than last year.
Scientists say the rise is due to long periods of sustained hot weather over the summer.
They say the insect's natural predators have not been able to keep up with the growing stink bug population.
Stink bugs give off a pungent smell when they're frightened or crushed.
They like to enter homes as the weather cools in the fall.