I have had a major problem with Trimec this year. I have used Trimec Classic for the past 5+ years on Fescue lawns with great results. I generally use a backpack sprayer and broadcast over the lawn to kill the growing weeds before the hot summer arrives. After that I spot spray it on the remaining weeds to keep from harming the fescue in the summer. This past year I had about 3+ gallons of mix left over in a container and decided to use it on my own lawn before mixing new for the customers. It is a good thing I did because about a week later the weeds started dying but it seems the fescue also was harmed. Part of the yard has completely browned out. It has been about 4 weeks now and my yard looks really bad. I did aerate parts and have overseeded with new seed in the past week. At least all the customer yards are reacting correclty and the fescue was not harmed. Did something happen to the Trimec during the 8+ months of storage that caused this? Is there anything I can do to the areas that have yellowed or turned light. Seems to be a slow death for some parts of the lawn. Thanks in advance.... Cleve.