I don't think my earlier post "took."So here is a brief repeat.
I suspect you have run this down, but just to make sure:
One area originally called "Plumtree Island" is now called "Mush Island," and is located on the south bank of the Roanoke (former Morotock) River, just east of Weldon, NC, in modern-day Halifax County.
That area was part of the following counties in order: Albemarle (through about 1685), Chowan (through 1722), Bertie (through about 1741), Edgecombe (through about 1758) and Halifax (since 1758).
Note that each county transition took time, and records can be spread out among adjoining counties for any particular point in time.It is always smart to check those, if they have survived.
This area is about eight miles or so north of the old and historic town of Halifax, and was first settled by Europeans in the early 1720s.
There are also other "Plumtree" this and thats spread all over the South -- even a community in modern Avery County, NC!