White moldy stuff on marathon grass

[raydar]

Hello, I noticed some white patches on my marathon lawn. It looks like spider web. How can I treat it and prevent from happening again?

 

[Chuck]

It looks like Pythium Blight to me. It is very common in fescue grasses. Google how to control pythium blight. There are a lot of different chemicals you can use.

 

[oneeye]

I can see you need to tell your lawn man he needs to sharpen his lawnmower blade because it's doing damage to your grass.