Here is a bunch of Brother Stephans, with one Dick Ward in the middle. It's the end of season, we've had a drought, and the leaves on many of my hostas are turning yellow. Should I be concerned about the dead spots on the leaves over on the right?

Here's a closeup of one spot.

Here's the underneath of that spot.

Here's a second spot.

And here's the underneath of that one.

I hope you folks tell me this does not look to you like foliar nematodes.