Last year a member posted about gray leaf spot on newer TTTF that had included using Tenacity as a pre. I may have had much the same on a new lawn in Sept, 8 weeks after using Tenacity as a pre. Has anyone else seen any problems using Tenacity on a newer TTTF lawn? I am going to go after poa triv suppression on a TTTF lawn that is about 1 1/2 years old in a larger area of the lawn. Moderator, please edit the header to read Tenacity.