It is a common fungal infection, Janice. Too much water (from rain, sprinklers, water hoses), constantly humid weather or watering too much can cause that. Being so late into the growing season, I would hesitate to recommend spraying though.

When the leaves & blooms fall in the Fall, throw them in the trash. Do the same with any plant debris under the plant as well. On a plant with a fungal infection, they can harbor fungal spores so do not add them to a compost pile or use them as mulch (although it is ok to mulch them if the plant has no fungal infections though).

By the way, I noticed on the picture that the leaves look wet. If that is because you are watering by hand, I suggest that you water the soil instead of the leaves.

Luis

Luis - thanks much for such an informative post... I've now been watering only the dirt (and not as often).... the plant looks so much better...

Will certainly remember what you've said about discarding the leaves..

janice