How to take care of lawn fungus

From the "It's All Relative" SoilKit webinar for homeowners on 2/26, George Woerner and Christina Woerner McInnis answer the questions “Last summer, an area of my lawn had white, hard white fungus growing. Do you have any idea of what it might be? If it comes back, how do I get rid of it? If I use SoilKit to test the soil in that area, will it tell me anything?”