Sudden death in blue mistflower
New to the mid atlantic and unfamiliar with disease that is killing this colony of volunteer blue mistflower. Is this fungal? Are the few remaining plants savable? The “permanent wilt” started at the center of this once-lush colony.
We do not see any kind of fungal spots on the leaves. Since the plants are collapsing quickly, we suspect it is Southern Blight.
Here is our webpage about it: https://extension.umd.edu/hgic/topics/southern-blight Read carefully.
It is nasty stuff. Wear disposable gloves and replace the soil after you clean out all the infected material or turn it over deeply to bury the spores.