Yes, the mild winter and early warm spring allowed the botrytis to get a head start. The two products on the left (view) in the picture below are what I use to control botrytis. The powdered one I mix and spray proactively on the soil before the noses pop up. The liquid version I dilute and spray directly on the plants every couple weeks. There is also a hand spray bottle of the pre-mixed version available. All of these are made by Bonide and can be found at your better (upscale) garden centers. For soil borne pathogens that cause bulb rot, etc. I mix a little Captan into the soil at planting time (shown on the right in the picture below.
I like your way of how you grow lilies for yours and others enjoyment. It sounds like you have a well thought plan that (other than this recent botrytis event) has worked out well for you for some time. I really look forward to seeing some pictures when they start blooming.
