Please help salvage my Climbers
I posted this on the regular forum and want to know if there's anything I can do organically to salvage 5 large climbers loaded with blackspot. Cornell formula is just not doing it (works great on my hybrid teas though). I waivered on the organic commitment and tried Bayer All in One which didn't help either. Don't want to spray a bunch of toxic stuff but really don't want to shovel prune even more (they are all blooming gloriously right now and my heart is breaking over the blackspot). Help?!!