Hi, Apologies my previous question didn't have the pic uploaded. Please see attached now. Thanks Dave
Certified GKH Gardening Expert
Yes, that is more than likely a soil infection. I noticed it is pretty wet as well. If it remains like this for too long, then this can happen.
Just apply wettable sulfur and about a tablespoon of dolomitic lime. It should clear the infection in the soil. It won't make the dead growth turn green, but any new growth will be healthy. You can cut out these dead spots if you wish.