What’s going on here? Why the red streaks and spots? It should be said that this is in a cutout and looks like it might have to do with runoff from his roof. The red area in the pic is actually getting runoff from two sections of roof. One coming from directly in front of it and the one right beside it (kind of seen in pic).
Sh will get rid of it most likely, I usually see it around the bottom of homes where there was bushes or mulch.
I’d suggest doing some test spots.