Green bermudagrass in March, but what are the spots?

Bermudagrass green up in March is unheard of on the Eastern Shore.  The temptation is to mow it and clean it up.  I subscribe to patience is better.  IF we mow the bermudagrass too early and we have a cold snap, the turf can be set back in its development for the season.  There are some spots that are not greening up as rapidly or not at all.  This is Spring Dead Spot.  This is a soil based fungus that really has no cure.  Some instances the fungicide Rubigan has been an effective preventive.  In my experience, it is costly and the return on investment is very, very spotty.  We try to avoid SDS by raising mowing heights in the late summer.   Some of the spots are starting to grow.  We will scalp the fairways and fertilize as the weather consistently becomes warm. 

Some of the spots are from our RoundUp spray in January.  In these cases, the bermudagrass is starting to fill in the voids without competition.