Photo 1. Reddish-brown and black streaks of black Sigatoka, Mycosphaerella fijiensis, on the upper surface of a leaf, with some developing white or tan centres where the spores are produced. Note that the spots have bright yellow haloes, or margins.
Photo 2. Long streaks with bright yellow margins typical of infection by black Sigatoka, Mycosphaerella fijiensis. Note the blighted areas at the leaf tip and margins where the spots have joined together to cause the blight.
Photo 3. Typical decay of a leaf infected with black Sigatoka, Mycosphaerella fijiensis, showing the brown streaks, some with white centres, and the edges of the leaf decaying before other parts where the streaks have joined together.
Diagram. Life cycle of black Sigatoka, Mycosphaerella fijiensis. Note that there are two types of spores, but it is the sexual stage that produces the ascopsores that are considered the most important in disease development. The spores are discharged from the top surface of the leaves and spread by wind.
Black Sigatoka, black leaf streak
Mycosphaerella fijiensis. This the name of the sexual state; the asexual name is Paracercospora fijiensis (previously Pseudocercospora fijiensis).
AUTHORS Helen Tsatsia & Grahame Jackson
Information from CABI (2019) Mycosphaerella fijiensis (black Sigatoka). Crop Protection Compendium. (http://www.cabi.org/cpc); and from Black Sigatoka. Business Queensland. Queensland Government. (https://www.business.qld.gov.au/industries/farms-fishing-forestry/agriculture/crop-growing/priority-pest-disease/black-sigatoka).
Photo 1 Kohler F, Pellegrin F, Jackson G, McKenzie E (1997) Diseases of cultivated crops in Pacific Island countries. South Pacific Commission. Pirie Printers Pty Limited, Canberra, Australia. Diagram APSnet Education Center. Back Sigatoka of bananas and plantains, American Phytopathological Society. (http://www.apsnet.org/edcenter/intropp/lessons/fungi/ascomycetes/Pages/BlackSigatoka.aspx).
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production , implemented by the University of Queensland and the Secretariat of the Pacific Community.
This mini fact sheet is a part of the app Pacific Pests and Pathogens
The mobile application is available from the Google Play Store and Apple iTunes.