Blotch rot

Cranberry fruit rot refers simply to any berry showing rot symptoms, regardless of the causal agent. Rotten fruit usually have watery spots with softened pericarp tissues. Lesions on mature berries are lighter in color than the surrounding healthy tissue, and the epidermal tissue within the lesions often is translucent, becoming darker in color as the rot progresses. Occasionally fungal fruiting bodies will form on the surface of the berries. Typically cranberry fruit rot diagnostics requires isolation and identification of fungi from symptomatic fruit on microbiological media.