Removing Sod to Re-sod
We need to get rid of our front lawn and redo it. It's one big rectangle of about 650 square feet. I have read conflicting advice about how to remove old sod when you are going to lay new sod. Some say just till under the old sod because the organic material helps the new sod. Others say you must remove the old sod and get rid of it because if you till it under it may transfer fungus or disease to the new sod.
So I'm not sure what to do with the grass I currently have - till it or remove it. What is the general opinion on this site?