Symptoms of leaf speckle caused by Cladosporium, first appear as pale-brownish spots, like pencil marks, 0.5 x 1.5 mm. These spots are easily distinguished by transmitted light and can be seen 3-4 weeks after the youngest leaf unfurls. The spots elongate to streaks which increase in size, becoming lesions about 15 x 30 mm. These lesions may coalesce and yellow, later becoming a violet-black colour. Eventually, whole leaves become necrotic. Mature lesions may also be seen on the midrib of leaves.