 Unfortunately, you can't just spray a fungicide one time like you can with a lot of other diseases. It takes a planned approach, often utilizing five to eight of the 12 best ways that we know to slow down this disease. First, make sure your drainage is great. If that means adding tile or adding calcium, do it. If that means building soil organic matter or reducing compaction, work on that. If drainage is great, mushroom growth will be minimized, soil health will be improved, and your crop will have much more energy to fight off any disease that comes its way.