Have you tried calling the manufacturer, Consan 20? I've used it for decades but mainly for sanitizing.
They say that it can:
"Physan 20 can also be used to treat Bud Rot, Crown Rot, Downy Mildew, Gray Mold Rot (Botrytis), Root Rot, Anthracnose, ..."
I was just wondering if anyone here use it against anthracnose and how well it works.
Thanks,
Herman