We call them "carpenters" here, and I do have zillions of them because of being in the woods and plenty of sticks, boards and other habitat. They will congregate under anything, including row cover. And they have done some nasty damage to little seedlings when at their worst.
All the same I mostly ignore them. If they get under my row cover, the solution is to take it off, give it air and light.
Trapping works well too - and too easy. Just lay down a board, they'll be under it in droves.
