We bought a new house in 2006 in which the lawn was sod. We bought in the fall and the sod was not doing so well. This last spring and summer we fertilized and watered and it appeared to be coming back pretty well until Fall came. All of sudden our grass has "rust" and there are numerous patches of mushrooms.

We checked the PH of the lawn and it is 7 which seems to high for lawn. We believe this "new development" in which we live was built on old farm fields. There are no trees but we do live in northern Minnesota/Fargo area so not sure what was here in the past.

Any ideas on what we can do to get our lawn back on track so next spring it is healthier?

Mike and Mary