Outbreaks of Alternaria Brown Spot of Citrus in Brazil and Argentina

Plant Disease
N A PeresL W Timmer

Abstract

Alternaria alternata (Fr.) Keissler causes lesions on leaves, twigs, and fruit and reduces yield and fruit quality of many tangerines (Citrus reticulata) and their hybrids (2). Severe outbreaks of Alternaria brown spot were observed on 'Murcott' tangor (Citrus reticulata × Citrus sinensis) trees in southern São Paulo, southern Minas Gerais states in Brazil, and in Misiones and Corrientes provinces in Argentina. A single diseased 'Fortune' tangerine tree was observed in a grove in Misiones. On young leaves, brown-to-black lesions often expanded to cover large parts of the leaf, causing abscission of young shoots and dieback of twigs. Lesions were often surrounded by yellow halos. On fruit, dark specks from 0.2 to 0.5 cm were observed, and severe infection caused premature fruit abscission. Isolations were made on potato dextrose agar (PDA) after surface sterilization of leaf and fruit tissues in 1.5% sodium hypochlorite for 1 min. Plates were incubated at 27°C in the dark for 1 week. Isolated colonies were olive brown to black, and the fungus was stimulated to form conidia by scraping the surface of the mycelium. The pathogen was a typical small-spored Alternaria species, and the morphological characteristics of the conidia and ...Continue Reading

Citations

Nov 1, 2003·Molecular Plant Pathology·Kazuya AkimitsuL W Timmer
Dec 1, 2018·International Journal of Food Microbiology·Andrea PatriarcaBirgitte Andersen
Mar 11, 2021·Molecular Plant-microbe Interactions : MPMI·Yunpeng GaiHongye Li
Jun 15, 2019·International Journal of Biological Macromolecules·Milena Santos DóriaFabienne Micheli
Oct 16, 2021·Molecular Plant-microbe Interactions : MPMI

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