I see all these moths flying in my yard. Do they cause damage?

Yes, if there are enough of them feeding on the turf. These are most likely Sod Web Worms. Damage by sod web worms first appears as small brown patches of closely clipped grass. These patches may coalesce to form large irregular dead areas. Scheduling a surface insect application for the sod web worm larvae during the growing season will also help minimize stress and turf damage.