The most important thing you can do is seal your home against the invasion. Caulk and seal all windows, cracks, etc. Perhaps new door seals are in order, too. Try to keep an earwig free zone on the outer perimeter of your home by removing leaves, mulch, etc. Diatomaceous earth (food grade/horticultural grade) or boric acid is useful when sprinkled in areas where you've seen earwigs.

Thanks for the info. I may sprinkle the diatomaceous earth, boric acid or gravel around the foundation wall to make a barrier against earwigs and other pest invaders. Do you know where I can get the diatomaceous earth and boric acid?

Most decent garden departments will sell both, but certainly the Diatomaceous earth. Just be sure to get food/horticulture grade and not pool grade. The boric acid ought to be available, too. I purchased a container of 'Roach-Pruf' (boric acid) about ten years ago and still have some of it.

Oh, boric acid should not be applied outside, as it will dissolve and is also a soil contaminate. Use it inside where you see the insect activity. DE can be used outside and inside.

If you do a google search on earwig control, you'll see other suggestions......but I will never recommend chemical alternatives on these forums.

Does the diatomaceous earth have an effect on the lawn/grass?

No. You can use it freely on lawns, plants, etc. You need to handle the product carefully as the dust should not be inhaled, but it is food safe. As a matter of fact, it is used in grain bins to prevent the insect infestation of ALL kinds of stored grains. It's also fed to poultry and livestock and even pets to kill and prevent parasites. We all probably ingest some every day in our bread, pasta, peanut butter, cereal, etc.

But just don't breathe it into your lungs. ;-) The DE you use must be food/horticultural grade and not the stuff meant to filter pools.

Thanks. How often should the food grade diatomaceous earth be sprinkled, once a season, year or what else?

You could try some other controls as well like cleaning up yard debris, wood piles, garden ornaments which space beneath to harbor, even remove mulch until a hard freeze too since eggs are laid under mulch too. They find cool, damp hiding places during the day to hide. Doing that for the last 2 years has helped deplete the population in my yard. I wait to lay spring mulch in the garden a little later than usual too to avoid seedling damage. These practices will at least prevent an over-population around your home.
Be aware too that Earwigs are also great aphid control :D

Vera

Having noticed the earwig invading the house through the wall cavities and cracks, I have tried to fill them. But, there may still have some behind the stucco. I couldnÂt see them. Does the earwig have any effect on the house structure?