[bert]

Deeetroit is the pattern

White people and others left the city to the Feral Africans that lack the intelligence to live in a civil society. American cities have become habitat for feral African parasites. They are the human equivalent of Cryphonectria parasitica

[Blueflag]

Chestnut blight?

[Blueflag]

I will go with Microcystis aeruginosa.

Pond scum ;-)