I lost a dogwood to it, and the stuff seems common on this property. The tulip tree is showing symptoms on the leaves.

It doesn't tend to kill the tree, it's just very unattractive. I'd rather not pull out a hefty fungicide for this as the probability of tree death is near-zero and it's growing like mad and quite healthy otherwise.

Leaves from that tree and any branches or twigs will not be mulched and will be removed from the property.

Is there any low-powered, targeted fungicide that works on anthracnose?

low-powered + anthracnose is like the jumbo shrimp oxymoron.

low-powered + anthracnose is like the jumbo shrimp oxymoron.

Yeah, I know, but hope springs eternal and all that. With it being unlikely to kill the tree, I'd rather not wipe the helpful fungi.

read things about Phosphites and Serenade being useful

I'll poke around, thanks! Serenade definitely meets the low-powered but useful category if it'll work. Phosphites probably will, too...