Symptoms
Leaf spots are small (1 to 3 mm in diameter), circular, and gray with brown to purple margins. Fruit lesions are circular, brown to gray, hard, and slightly depressed.

Pycnidia may be visible as small, black pimples in leaf as well as fruit lesions. A hard, dry rot appears on green as well as ripe fruit. Symptomless fruit may become speckled and rot in storage.

Disease cycle
The two fungal species involved in this disease also attack cranberries. Both produce rain-splash dispersed conidia. Not much is known about the life history of these fungi.

Management
Avoid susceptible cultivars; limit overhead irrigation; apply effective fungicides.