03115naa a2200265 a 450000100080000000500110000800800410001902200140006002400300007410000170010424500690012126000090019050008520019952014970105165000180254865000110256665300140257765300130259165300370260465300370264170000140267870000150269270000160270777301260272310645972024-04-17       2023    bl uuuu     u00u1 u    #d  a0031-94657 a10.36253/phyto-146752DOI1 aLOMBARDO, P.  aCercospora leaf spot of olive in Uruguay.h[electronic resource]  c2023  aArticle history: Accepted 7 November 2023, PublishedPublished 30 December 2023. -- Correspondence: Lombardo, P.; Departamento de Ciencias Biológicas, CENUR Litoral Norte, Universidad de la República, Gral. Rivera 1350 CP 50000, Salto, Uruguay; email:palomba@fagro.edu.uy -- FUNDING: This research was funded by the Commission Sectorial the Investigation Scientific (CSIC - Uruguay). The first author obtained a scholarship from the National Agency for Research and Innovation, Uruguay (ANII scholarship POS_NAC_2017_1_141615.) to carry out the research as part of a PhD project. -- Editor: Lizel Mostert, Faculty of AgriSciences, Stellenbosch, South Africa. --Document type: Article Gold Open Access. -- LICENSE: This work is licensed under a Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/ )  aSUMMARY.- 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 Pseu-docercospora 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.  © 2023 P. Lombardo, C. Leoni, S. Alaniz, P. Mondino. This is an open access, peer-reviewed article published by Firenze University Press (http://www.fupress.com/pm) and distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. All Rights Reserved.  aOLEA EUROPAEA  aOLIVOS  aArbequina  aEtiology  aPseudocercospora cladosporioides  aSISTEMA VEGETAL INTENSIVO - INIA1 aLEONI, C.1 aALANIZ, S.1 aMONDINO, P.  tPhytopathologia Mediterranea. 2023, Volume 62, Issue 3, pp. 413-426. https://doi.org/10.36253/phyto-14675  -- OPEN ACCESS