Generally if you have a wire or hatpin handy, you can just stab them and get them out. Gross little buggers and it is often hard to squish them inside the leaves if you find them as if they are not really fat, they are tough. Fat ones squish well but they are usually in the rhizome by the time they get fat.
I have actually found a borer in my LA irises and did not know they would get them. I guess I will have to include them in my chemical treatments next year.
