Daconil, Bayer, Immunox and other fungicides are supposed to be effective. It's possible that regular use of Bayer on your roses has produced a resistant strain that has infected your lilies-- spores are airborne. Daconil might work. Resistance to Daconil is less likely to develop.

Thanks. At least I know that Bayer should work, I was begining to wonder if it does. This spring has been like the monsoon season so I am sure the wet weather is responsible for the outbreak when I had never had one before.

Most of the lilies are fine, it really is only afew but I would like to cure them. I haven't sprayed the lilies last year as I didn't need to, only this year so I feel its unlikely that I have a resistant strain. Of course some lilies are interplanted with the roses and they got sprayed for the past few years because there was no way not to spray them.

Again, spores from Botrytis on the roses and the mulch under the roses would find their way to the lilies. The same species infects many plants and also dead organic matter. It is highly mobile with airborne spores. It evolves more rapidly than blackspot. I don't know if evolved resistance is the cause, but you have a factual conclusion that weekly spraying of Bayer doesn't work in your situation.

From personal experience I can say that BannerMaxx has no effect on Botrytis nor is it indicated for Botrytis. Since the active ingredient in the Bayer product (tebuconazole) is in the same family and has the identical preventative action on blackspot as the active ingredient in BannerMaxx (propiconazole) I am quite certain that the Bayer product is ineffective for Botrytis as well. Also I have never read anything that claims either product works for Botrytis. If you do a little work you will see that the family of dicarboximide fungicides has been scientifically shown to have a specific action against Botrytis but it sounds like it is not that effective because Botrytis apparently mutates quickly so particular fungicides may become ineffective. Botrytis also spreads very fast. My own impression has always been that if you get prolonged cool wet conditions you get Botrytis and there is nothing you can do but remove all infected buds and blooms and hope the weather improves.

When the roses get those water spots common at this wet wet time of the year isn't that also Botrytis? I recall when I was using the Bonide Infuse instead of the Bayer that when my roses got spotted I sprayed them and the spots dissappeared from then on.

Yes, pink spots on petals are caused by Botrytis. But any control effect by a fungicide would have to come from spraying the new unblemished flowers as they are opening. The presence or absence of the disease is probably governed more by the weather than what the gardener does.