I received a call from a guy whose backyard was turning brown. Here's the info he gave me. He sodded his from yard in 2003 and seeded the backyard the same year. The front yard looks great, but the back yard is starting to show some brown in several areas and in no particular pattern. I didn't notice any circular pattern or frog-eye spots. We have had alot of rain lately. He also told me that the back yard had some rust early in the season every year. The turf does not come up easily, so I took grubs out of the question. Could it be another pest or is it some for of disease?