Photo 1. Large brown spots of early blight, Alternaria solani, on tomato, showing characteristic rings or targets.
Photo 3. Characteristic rings or target structures on potato leaf caused by early leaf blight, Alternaria solani.
Photo 7. Spots of Alternaria solani on potato leaves leading to collapse and death as they expand and join together.
Early blight of tomato and potato, target spot
AUTHOR Grahame Jackson
Information from Diseases of vegetable crops in Australia(2010). Editors, Denis Persley, Tony Cooke, Susan House. CSIRO Publishing. Photos 1,4-6 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. Photo 2 (taken by Eric McKenzie), and used in this fact sheet, appeared previously in McKenzie E (2013) Alternaria solani. PaDIL - (https://www.padil.gov.au). Photos 3,7&8 Jacquie (Wright) Kami, formerly Plant Pathologist, Secretariat of the Pacific Community.
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.
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