My bermudagrass lawn is ten years old, don't know if this matters. I have, this year only, brown patches all over xcept in the St. Augustine grass that has crept over from my neghbors yard. This is the first time I hve noticed his condition. I mow weekly with a mower setting at 1 1/2. I have attached an image, hopefully you can see my concern. I water twice a week at 0600 for 15 minutes for in each area. Is it desease or how I am caring for my lawn?