Abstract
Over the past two decades, there has been a marked increase in Uruguayan olive production. However, the humid climate of Uruguay creates favorable conditions for the development of olive anthracnose, characterized by fruit rots and blossom blight, which are frequent and destructive symptoms. Several species of Colletotrichum are responsible for the disease, with C. acutatum sensu stricto (s.s) being the most prevalent. This study aimed to analyze the survival of Colletotrichum in an olive orchard with a history of olive anthracnose. For two consecutive years, samples of fruits, leaves, and woody organs were collected monthly from aerial parts of the olive tree. Colletotrichum spp. structures were recorded in a climate chamber, and C. acutatum s.s. was quantified. The study demonstrated that Colletotrichum can survive in different organs of the olive tree, with mummified fruit being the primary survival site, followed by leaves and branches. Among the leaf and woody organs, yellow leaves, leaves from defoliated branches, terminal dry branches, and healthy new branches were identified as important survival sites. Mummified fruits were not always present on the tree throughout the year, and leaves and branches can serve as the primary source of initial inoculum for infections of flowers and fruits in their absence.
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This study was supported by Agroland S.A. and Nuevo Manantial S.R.L.
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Ferronato, B., Ingold, A., Moreira, V. et al. Detection and quantification of Colletotrichum survival on olive tree (Olea europaea L.). Eur J Plant Pathol 167, 77–87 (2023). https://doi.org/10.1007/s10658-023-02686-z
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DOI: https://doi.org/10.1007/s10658-023-02686-z