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z peat moss (n = 12 per isolate). Plants dipped in sterile distilled water were included as control (n = 12). Chlorotic leaves, wilt and internal wood discoloration were observed on inoculated plants at 3 months after inoculation. No symptoms were observed on controls. The pathogen was consistently reisolated from the basal stem and roots of inoculated plants. Apiospora marii has been reported in olive in Italy, causing tree dieback (Gerin et al. 2020). To our knowledge, this is the first report of A. marii causing wilt, dieback and tree decline in olive in Spain (Farr and Rossman 2022).