Diversity and Pathogenicity of Botryosphaeriaceae and Phytophthora Species Associated with Emerging Olive Diseases in Italy

Benedetto T. Linaldeddu (), Giovanni Rossetto, Lucia Maddau, Thomas Vatrano and Carlo Bregant
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Benedetto T. Linaldeddu: Dipartimento Territorio e Sistemi Agro-Forestali, Università degli Studi di Padova, Viale dell’Università 16, 35020 Legnaro, Italy
Giovanni Rossetto: Dipartimento Territorio e Sistemi Agro-Forestali, Università degli Studi di Padova, Viale dell’Università 16, 35020 Legnaro, Italy
Lucia Maddau: Dipartimento di Agraria, Università degli Studi di Sassari, Viale Italia 39, 07100 Sassari, Italy
Thomas Vatrano: Independent Researcher, Via Einaudi 9, 88021 Borgia, Italy
Carlo Bregant: Dipartimento Territorio e Sistemi Agro-Forestali, Università degli Studi di Padova, Viale dell’Università 16, 35020 Legnaro, Italy

Agriculture, 2023, vol. 13, issue 8, 1-18

Abstract: Extensive collar rot, sunken and bleeding cankers, shoot blight, and fruit rot symptoms on olive trees have recently been observed in several orchards in Italy. Since there is little information about the etiology of these diseases and given the high economic relevance of this iconic crop, a study was conducted from autumn 2017 to summer 2022, in four Italian regions, to define the occurrence, distribution and impact of the main pathogens involved. A total of 1064 symptomatic olive samples were collected and processed. Based on colony appearance, micromorphological analysis and DNA sequence data, thirty-eight species, including eighteen Botryosphaeriaceae species belonging to five genera and fifteen Phytophthora species, were isolated and identified, thirteen of which, Diplodia africana , D. fraxini , D. subglobosa , Dothiorella omnivora , Do. sarmentorum , Do. sempervirentis , Sardiniella urbana ( Botryosphaeriaceae ), Phytophthora cactorum , P. cinnamomi , P. citricola , P. crassamura , P. niederhauserii and P. pseudocryptogea , are reported here for the first time in olive trees. Pathogenicity tests performed on unripe drupes and on potted olive seedlings completed Koch postulates and highlighted that several species of Botryosphaeriaceae and Phytophthora represent a growing threat to olive trees.

Keywords: invasive pathogens; drupe rot; branch dieback; root rot (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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