What is wrong with my rhodos? Photo Link
I have two beautiful rhodos blooming now (one is Unique and the other I forget) but both of them have ugly black spots on some, not all, of the flowers. They are established plants and I don't remember ever seeing this problem in the past. I've posted a link below to my two photos- and I think if you click on the photos they will enlarge.
Can anyone identify the problem and provide a solution? Thanks!