The area flown is a very small bowling green dataset with some disease showing

This is the high-resolution LaQuinta RGB image 

(Red) NDVI – This is the NDVI image from the 4-band imagery. The “ring” area infestation is not showing much stress yet. The greenkeeper likely treated these rings with something. They actually show a bit more vigour along the rings outsides than the surrounding areas. Likely the infestation hasn’t had a chance to actually do damage yet.

Green NDVI – estimates photosynthesis and determines water & nitrogen uptake in the plants. As seen, there are areas of good photosynthesis  around the ring areas (areas have been treated recently and are recuperating). The red areas around this show poor photosynthesis – likely an advance warning of infestation spread.