I'd like to interject something about my use of Messenger.
on the AHS Robin, the folks seem to think Messenger is a waste of money on daylilies.
I went to the same gardens, bought plants from the same people as two daylily friends that live very close to me. One seller told me that they had an outbreak of rust 2 weeks after we all bought plants there.
The other two gardens did get rust.... mine did not.
I also think that seed set on stubborn plants was a bit better.
I definitely saw a difference using Messenger on my potted geraniums, etc.
I tried it on beebalm to see if it would help mildew, but didn't see much difference.