Blueberry scorch virus BIScV
Damage: Flowers and/or leaves blight and die, while stems remain green. Yield is reduced. Some varieties, like Bluecrop, may not show blighting but leaves may turn slightly yellow and yields will be reduced. Symptoms appear at blossom and remain visible from spring to mid-summer.
Disease: BIScV is spread by aphids and infected propagating plant materials. The virus can spread rapidly in the field. Bushes infected with this disease will never recover.