Fruit have gray splotches or black regions on them.

Powdery Mildew

Severe powdery mildew on red currant fruits

Powdery mildew infection on fruit of currants (left) and gooseberries (right).

• Causal organism: Sphaerotheca mors-uvae (Schwein.) Berk. & Curt., North America, Europe, Asia, Australia, New Zealand
• Crops affected: Black, red, white, ornamental currant, and gooseberries

The disease increases in cool, humid, and rainy periods during the spring and early summer.

See: Powdery mildew leaf symptoms

See: Powdery mildew whole plant symptoms

See: Additional photos and control information from Oregon State University