My lawn has suffered from a fungus the last two years. Late last summer it appeared that I got it under control but the lawn has never looked very good. I've had soil tests done on the soil so I know the problem isn't nutrient related and there has been a number of mushrooms in the lawn so I believe a fungus is the culprit. After a good 24 hour rain I sprayed Biotamax on the grass to the left of the red pole. to the right I sprayed Spectracide Immunox Desease Control. In two weeks I'll be checking back in to see which part of the lawn is doing better.
Not a very scientific study but it will be interesting to see how a non-chemical fungus control might work.