what a shame....if it's not too many...you could use straight white vinegar in an old pointed top mustard container.......................if that does not work for you...this is a fungus....and you would need to get fungicide and follow the directions on the container.............you might also want to check the side of weed & feed to see if that takes care of mushrooms. keep children & pets away until a good rain washed it in....also whereever you bought your sod might even have a better idea.