In this undated photo provided by the University of Florida, hard spots with black pycnidia caused by Guignardia citricarpa are shown on citrus fruit. Citrus Black Spot, a fungal disease caused by Guignardia citricarpa, appears inevitable to spread across Florida.

In this undated photo provided by the University of Florida, hard spots with black pycnidia caused by Guignardia citricarpa are shown on citrus fruit. Citrus Black Spot, a fungal disease caused by Guignardia citricarpa, appears inevitable to spread across Florida.

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