Most of it looks like it is just dormant. Something else to look into is: Chlorosis - Turf areas may become pale green-yellow, and plant growth may be somewhat stunted. In most cases this chlorotic condition is due to lack of nitrogen. If a nitrogen fertilizer application does not correct this condition, it is very likely that the cause is iron deficiency. An application of iron sulfate or chelated iron on turf showing iron deficiency will result in a greening of the turf within a few hours after application.
Here is a link with some good information for correcting the problem: http://www.gardenguides.com/81606-fi...rass-lawn.html