Dieback of an olallieberry cane and its leaves apparently due to cane blight, Paraconiothyrium fuckelii =Kalmusia (=Leptosphaeria) coniothyrium.

Reddish cane cankers and wilted, necrotic leaves on olallieberry possibly infected with cane blight, Leptosphaeria coniothyrium (Loculoascomycetes). Davis CA by JKC  Credit: Jack Kelly Clark
Credit: Jack Kelly Clark