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Blueberries: Sudden death of whole plant(s)

One cause of sudden death in blueberry plants is Blueberry Scorch Virus (BlScV). BlScV is an aphid-transmitted virus. Sudden and complete death of leaves and flowers occurs with some cultivars.

Blueberry bush with dead, dry canes irregularly distributed in the bush.
Blueberry Scorch Virus on Berkeley, photo courtesy of Kathleen Demchak, Penn State University.

Other cultivars may show display interveinal red color on leaves. Twigs may also die back 2-4 inches. Severe infections can kill the bush.

Blueberry plant with bright red color on entire leaves, except for veins which remain green.
Blueberry Scorch Virus (BlScV)

More information on blueberry viruses.