What is this? I've got tiny holes in every single variety of hosta (about 30 varieties)--at first I thought it was slugs, but now.... Some of them are the 'brown'thatched --not totally holes, yet, but most of them are holes.

This has happened suddenly--in the space of about 10 days--on all different sides of the house--so it doesn't look like something has spread from one infected plant.

Of course, we've had gobs and gobs of rain and cooler than usual temps, but...

Any ideas?