Recently, a lot of my pine trees (maybe Virginia Pine or Loblolly?) developed what appears to be a white fungus at the base. (Photos attached) The affected trees are all clustered together and I have many other pine on my property that don't have this issue. It feels like something I should be concerned about.  One tree, which seems to be dying based on the lack of needles at the top, has the white blemishes higher up on its trunk as well. The fungus appeared very suddenly.  What's going on with my trees? Located in Midlothian near the Amelia County line.