It doesn't sound like they are borer eggs.
First of all borers have not laid eggs yet. They are in all likelihood pupating now. Then they hatch in Sept fly away as moths, and return to lay eggs.
Eggs are laid in clusters on the rhizome, or in those dried out folds where a leaf emerges from a rhizome but has died away. It is alleged that they can be laid on other dead material near the rhizome, but never on a green leaf, as that leaf would not survive the winter intact, hence the borers would not make it.
They are extremely difficult to see and almost microscopic in size. But they are not scattered one to two per fan.
I have borers, and have searched for eggs but have never seen any. They hide them well. The only picture I have seen was in an old AIS Bulletin. They were difficult to discern.
If anyone does have a picture, please post, as it would be very helpful to all of us.
Laetitia

Are you sure they're eggs and not droppings of some sort?