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Incubation Period of Helminthosporium papulosum on Fruit and Bark of Apples. Jack Taylor, Professor, Department of Plant Pathology and Plant Genetics, University of Georgia, Athens 30601. Phytopathology 60:1704-1705. DOI: 10.1094/Phyto-60-1704.

These investigations show that the incubation period of Helminthosporium papulosum on apple is 3-6 months on the fruit and 3-10 months on the bark.