The text on google books states: "the larvae borrow into the lily stem and bulb".
https://books.google.co.uk/boo...
Have you looked carefully to see if the leaves have been eaten Leslieray?
The stems show brown marks like a sawfly would make when cutting in eggs. There is a brown patch on the leaf on the right stem, could that be from a weevil? I'm not sure how they feed!
I had come across a sawfly which attacks "other arborescent plant families" in California.
Larvae in the tribe Cephini are internal borers in
stems of Gramineae, while those in the tribe Hartigiini
bore in the twigs of Rosaceae or other arborescent
plant families.
http://essig.berkeley.edu/docu...
Yes Sue, I think as the adult beetle chews it's way out it pushes the debris out but it doesn't seem possible to do that until the exit hole is complete. Maybe the debris gets dragged out with the beetle? I have seen the holes with small piles of dust pushed out, and you don't see holes until the beetle has eaten it's way out.
http://www.rentokil.co.uk/blog...
