[header] How to buy organic fungicides [title] Identify the disease infecting your plants. [step] In order to be sure that a given fungicide will actually work, you'll first need to verify that you're using the right product. Inspect your plants closely to look for symptoms like rotting, discoloration or a strange powdery residue. 
You can then conduct a quick search to find out the specific infection and how best to treat it. [substeps] Rotten or blackened areas are typically a symptom of blights and leaf spots.