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Symptomatology of Orange Fruit Infected by the Citrus Greasy Spot Fungus. J. O. Whiteside, Associate Plant Pathologist, Florida Citrus Experiment Station, IFAS, Lake Alfred, Florida 33850. Phytopathology 60:1859-1860. DOI: 10.1094/Phyto-60-1859.

A superficial blemish consisting of numerous minute black specks representing dead stomata is very common on orange rind in Florida. Oranges inoculated with the citrus greasy spot fungus, Mycosphaerella sp., developed similar symptoms. Although this fungus was frequently isolated from the rind of naturally affected fruit, it may not be the only local cause of stomatal necrosis.