I just looked it up online. I think one of my bulbs does have it. When I get home I'll remove the infected leaves. I don't think I've had it before but we had a really rainy Spring. We've also had fairly consistent rainfall this summer. Lily disease just makes the leaves look bad. None of the leaves have dropped yet so if I remove them the fungus shouldn't overwinter.
There are two other fungal diseases that impact the bulbs. I know I don't have those because this year I've gotten the biggest stalks and most flowers that I've ever had!