Andrea-
Holy Bleep is right! Years ago I had bought some in the powder form at very modest cost.........maybe $10-15. In the meantime I've been using Daconil & Sulfur alternatively with fair success. Also the EPA has drastically restricted what can and cannot be sold to residential households! Like Arlyn said the fungal pathogens almost cure themselves if given adequate hygiene and removal of all dead foliage. And you are wise to thin out very large clumps; that helps with airflow & sunlight.
These are the products that I use for fungal problems (along with good housekeeping).
