1. PaDIL Species Factsheet Scientific Name: Passalora arachidicola (Hori) U. Braun (Ascomycota: Dothideomycetes: Capnodiales: Mycosphaerellaceae) Common Name Passalora arachidicola Live link: http://www.padil.gov.au/maf-border/Pest/Main/143048 Image Library New Zealand Biosecurity Live link: http://www.padil.gov.au/maf-border/ Partners for New Zealand Biosecurity image library Landcare Research — Manaaki Whenua http://www.landcareresearch.co.nz/ MPI (Ministry for Primary Industries) http://www.biosecurity.govt.nz/ 2. Species Information 2.1. Details Specimen Contact: Eric McKenzie - [email protected] Author: McKenzie, E. Citation: McKenzie, E. (2013) Passalora arachidicola(Passalora arachidicola)Updated on 4/16/2014 Available online: PaDIL - http://www.padil.gov.au Image Use: Free for use under the Creative Commons Attribution-NonCommercial 4.0 International (CC BY- NC 4.0) 2.2. URL Live link: http://www.padil.gov.au/maf-border/Pest/Main/143048 2.3. Facets Commodity Overview: Field Crops and Pastures Commodity Type: Fabaceous produce Distribution: Oceania Groups: Fungi & Mushrooms Host Family: Fabaceae Pest Status: 1 NZ - Non-regulated species Status: 0 NZ - Unknown 2.4. Other Names Cercospora arachidicola Hori Mycosphaerella arachidis Deighton 2.5. Diagnostic Notes **Disease** Early leaf spot. Lesions subcircular, 1–10 mm diam., reddish brown on upper surface, often surrounded by a chlorotic halo which is more distinct on upper surface; spot distinctly brown on lower surface. Petioles and stems may be infected, and plants may defoliate. **Morphology** _Conidiophores_ mostly epiphyllous, 15–50 µm long, 3–6 µm thick, fasciculate, unbranched, 0–2-septate, pale golden brown, straight or flexuous, with thickened spore scars. _Conidia_ 35–110 × 4–5 µm, 1–12- septate, sometimes slightly constricted at septa, pale olivaceous, smooth, straight or curved, obclavate, apex subacute, basal cell tapered to the base, thickened spore scar at base. **Notes** Macroscopically early leaf spot differs from late leaf spot (_Passalora personata_) principally by the presence of a halo, and the spots are not as dark as those caused by late leaf spot. 2.6. References - Crous, P.W. & Braun, U. (2003). _Mycosphaerella and its anamorphs: 1. Names published in Cercospora and Passalora_. CBS Biodiversity Series 1. 571 pp. - Ellis, M.B. (1976). _More Dematiaceous Hyphomycetes_. Commonwealth Mycological Institute, Kew, Surrey, England, pp. 267–268. - Hsieh, W.-H. & Goh, T.-K. (1990). _Cercospora and Similar Fungi from Taiwan_. Maw Chang Book Company, Taipei, pp. 162–163. - Mulder, J.L. & Holliday, P. (1974). _Mycosphaerella arachidis. CMI Descriptions of Pathogenic Fungi and Bacteria 411_, 1–2. 3. Diagnostic Images Passalora arachidicola symptoms on upper Lower surface of a peanut leaflet with brown surface of leaf lesions of early leaf spot (Passalora In Life: E. McKenzie Landcare Research arachidicola) and black lesions of late leaf spot (Passalora personata) In Life: E. McKenzie Landcare Research Results Generated: Friday, October 1, 2021 .