Bitter rot of apple

Bitter rot of apple
Bitter rot on a Honeycrisp apple, showing characteristic sunken lesions. Concentric rings of acervuli are visible on the lesion surface.
Common namesApple athracnose, apple bitter rot, bitter rot, bitter rot of apple, Glomerella fruit rot
Causal agentsColletotrichum acutatum and C. gloeosporioides species complexes
VectorsRain-splashed
DistributionWorldwide in regions with warm wet weather
SymptomsSunken lesions that extend in a cone shape into the apple flesh
TreatmentPlanting of less susceptible apple cultivars, horticultural practices that promote tree health and reduce fruit wetness hours, removal of overwintering diseased twigs and fruit, and fungicides

Bitter rot of apple is a fungal disease of apple fruit that is caused by several species in the Colletotrichum acutatum and Colletotrichum gloeosporioides species complexes. It is identified by sunken circular lesions with conical intrusions into the apple flesh that appear V-shaped when the apple is cut in half through the center of the lesion. It is one of the most devastating diseases of apple fruit in regions with warm wet weather.

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