Vol. 62 No. 3 (2023)
Articles

Cercospora leaf spot of olive in Uruguay

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  • Pamela LOMBARDO,
  • Carolina LEONI,
  • Sandra ALANIZ,
  • Pedro MONDINO
Pamela LOMBARDO
Departamento de Ciencias Biológicas, CENUR Litoral Norte, Universidad de la República, Gral. Rivera 1350 CP 50000, Salto
Carolina LEONI
Unidad de Protección Vegetal, INIA Las Brujas, Ruta 48 km10, Rincón del Colorado, CP 90100, Canelones
Bio
Sandra ALANIZ
Departamento de Protección Vegetal, Facultad de Agronomía, Universidad de la República, Av. Garzón 780 CP 12900, Montevideo
Bio
Pedro MONDINO
Departamento de Protección Vegetal, Facultad de Agronomía, Universidad de la República, Av. Garzón 780 CP 12900, Montevideo
Bio
DOI: https://doi.org/10.36253/phyto-14675
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Published 2023-12-30

Keywords

  • ‘Arbequina’,
  • etiology,
  • Olea europaea,
  • Pseudocercospora cladosporioides

How to Cite

[1]
P. LOMBARDO, C. LEONI, S. ALANIZ, and P. MONDINO, “Cercospora leaf spot of olive in Uruguay”, Phytopathol. Mediterr., vol. 62, no. 3, pp. 413–426, Dec. 2023.

Copyright (c) 2023 Pamela LOMBARDO, Carolina LEONI, Sandra ALANIZ, Pedro MONDINO

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This work is licensed under a Creative Commons Attribution 4.0 International License.

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Abstract

Cercospora Leaf Spot (CLS) of olive is an important fungal disease in Uruguay, causing severe early defoliation. Fungal isolates were obtained from olive leaves with typical CLS symptoms from Uruguayan orchards. The isolates were identified based on phenotypic characteristics and DNA sequence analyses. Infection processes under field conditions were characterized. Phylogenetic analyses confirmed that Pseudocercospora cladosporioides is the causal agent of CLS in Uruguay. Three colony morphologies were observed for isolates growing on potato dextrose agar. Mean conidium length ranged from 65.7 to 101.8 µm, and widths from 4.3 to 5.0 µm. Mean optimum growth temperature was 21.5°C (range 19.2 to 24.8°C). Under field conditions, initial CLS symptoms on leaves were observed 5 months after inoculation of cv. Arbequina plants, confirming the disease’s lengthy incubation period. This study shows that CLS as one of the most prevalent and destructive olive diseases in Uruguay, and emphasizes the importance of further research to develop efficient management of this disease.

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