I have a back yard that was sodded with bermuda a few years ago and this year it looks horrible. The back does get some shade but I think it gets plenty of sun during the day. This year a lot of the grass is gone and I have this green/black film over the dirt. Any ideas what this is? This yard is having tons of problems. The front has a bad fungus problem I am trying to fight and you can see the grassy weed in the pic that is taking over the back now.