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Black sigatoka caused by Mycosphaerella fijiensis, symptoms are first visible as faint, minute, reddish-brown specks on the lower surface of the leaf. Specks elongate, becoming slightly wider, to form a characteristic narrow, reddish-brown streak with the long axis parallel to leaf veins. Streaks frequently overlap to form compound streaks.
The colour of streaks, which are now clearly visible on the upper leaf surface, changes to dark brown, almost black. The entire leaf can blacken at this stage if streaks are numerous. If less densely congregated, streaks broaden and become fusiform or elliptical spots. Water-soaked borders appear around spots and surrounding leaf tissue yellows slightly.