Hi All! I've been reading this forum for quite some time and have really enjoyed all of the great suggestions and help that is offered here. I've got this problem I hope someone can help me with. About 3 years ago, I replaced my lawn. I tripple killed everything and then had about 15 yards of new sterilized soil brought in. Then I put in a great sprinkler system and then seeded the lawn with ninjafica (sp?). Anyway, the grass looked great and I was one happy camper. That is, until I had these mushroom that started cropping up. I thought at first that it may have had something to do with over watering. I gauge the sprinklers run only twice a week giving me 3/4" each time for a total of 1 1/2"/week. Still, the muchrooms commeth fourth. I've even tried to stop watering all together for several weeks thinking that I can kill them with the lack of water. No such luck. As soon as I start watering again, their back in full force. It started out where they were only in about one sq. ft. of area. Now, they occupy about 5 sq. ft. The local nursery folks can offer only one suggestion. They say that I'm overwatering. I just can swallow that. No one can suggest anything that I can apply or do to get rid of this mushrooming problem. I'm at my ropes end and I need help. The only thing that I can think to do is to kill this entire area of the lawn and reseed it. I REALLY don't want to do this. Any suggestions? I could post some pictures this evening if it would help. Thanks in advance.