Bitter rot on a Honeycrisp apple, showing characteristic sunken lesions. Concentric rings of acervuli are visible on the lesion surface.
Common names
Apple athracnose, apple bitter rot, bitter rot, bitter rot of apple, Glomerella fruit rot
Causal agents
Colletotrichum acutatum and C. gloeosporioides species complexes
Vectors
Rain-splashed
Distribution
Worldwide in regions with warm wet weather
Symptoms
Sunken lesions that extend in a cone shape into the apple flesh
Treatment
Planting 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.[1] 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.[1] It is one of the most devastating diseases of apple fruit in regions with warm wet weather.[2]
^ abKimberly Leonberger, Madison McCulloch, and Nicole W Gauthier (2019). "Bitter Rot of Apple" (PDF). University of Kentucky Cooperative Extension Service. Plant Pathology Fact Sheet PPFS-FR-T-24.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^John W. Roberts and Leslie Pierce (1935). "Apple bitter rot and its control". U.S. Dept. Of Agriculture Farmers Bulletin (938). OCLC 15355792.
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