Thanks for the reply. Could not find that Safer fungicide here, so I just applied Daconil yesterday after removing all affected leaves.
Daconil is weirdly viscous. Gooped it all over my two elms, and after about an hour it dried and no longer visible.
We shall see how this impacts the tree and the fungi. All new shoots emerging lately are not lasting long--wilting, blackening, dropping. Hopefully this will stop that. Mature leaves yellowing and dropping, too.