Citrus Black Spot

Citrus Black Spot Information

Citrus black spot is a fungal disease marked by dark necrotic spots or blotches on the rinds of fruit. It produces early fruit drop, reduces crop yields, and if not controlled, renders the highly-blemished fruit unmarketable.

Citrus Black Spot in Florida

Symptoms of the exotic disease citrus black spot were first detected during a Citrus Health Response Plan - Multipest Survey (CHRP-MPS) in Valencia sweet oranges in the Immokalee area on March 8, 2010. This marks the first report of this fungal pathogen in North America, and constitutes a major jump in the geographical range of the pathogen.

Citus Black Spot Photos

Symtoms of citrus black spot in an orange

Typical black spot lesions on Valencia sweet orange caused by Guignardia citricarpa. (Photograph courtesy of T. Schubert, DPI)

Black spot in an orange

Close-up view of hard spot lesion containing pycnidia of the Phyllosticta citricarpa stage of Guignardia citricarpa. (Photograph courtesy of M. Thomas, DPI)


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