The disease evidently arrived when the powerline went in running north to south at the top of the ridge on the far left side of the pic. Or possibly when that gravel pit was scooped out just to the right of the earliest attack. Those earliest trees have been dead at least five years.
In 2010 it moved abruptly downgrade attacking the trees surrounding the cabin and in the vicinity of the chickenhouse. But I hadn’t noticed until I viewed the sat-image that it’s also moving west beyond the ridgeline [far left]. Beyond that ridge and to the west it’s heavily treed with oaks all the way to the western property line.
Judging from what’s happening to the west of the ridge there mightn’t be a red oak left on that side of the property within a couple of years.
But downgrade to the east there doesn’t appear to be any infestation at all, yet.
Truly a mystery.
My 2011 posts about this: