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Mycosphaerella alocasiae

Scientific Name
Mycosphaerella alocasiae
Scientific Author
Syd. & P. Syd.
Taxonomy
(Ascomycota: Dothideomycetes: Capnodiales: Mycosphaerellaceae)
Pest Status
2 NZ - Regulated pest
Status
0 NZ - Unknown
Reliability
High
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Diagnostic Images (5)
Diagnostic Notes
Disease

Small round leaf spot. Leaf lesions circular or subcircular up to 8 mm diam., but much smaller when leaf is heavily infected, grey centre with brown border, sometimes surrounded by yellow halo. Fungal fruiting bodies often visible, especially on upper surface of leaf as small black dots within spot. Disease is present on only oldest leaves.

Morphology

Ascomata on both sides of leaf, but more common on upper surface. Asci ellipsoidal or clavate, 35–45 × 12–15 µm. Ascospores 12–18 × 3–5 µm, hyaline, 1-septate, smooth. Conidiophores in fascicles, arising from stromata, emerging through stomata, unbranched, 5–35 × 2–5 µm, 0–2(–3)-septate, pale olivaceous to light brown, smooth, conidial scars conspicuous, 1–2 µm wide, slightly thickened and darkened. Conidia solitary, obclavate or subcylindric, fusoid, (15–)25–60 × 2–5 µm, (0–)1–5(–6)-septate, subhyaline to light brown, verruculose, apex rounded, base obconically truncate, hilum slightly thickened and darkened.

More Information
Specimen Contact
Eric McKenzie
Author
McKenzie, E.
Created
16/07/2013 09:43 AEST
Last Updated
14/04/2014 23:43 AEST
Citation
McKenzie, E. (2013) Mycosphaerella alocasiae (Mycosphaerella alocasiae) Updated on 4/14/2014 11:43:01 PM Available online: PaDIL - http://www.padil.gov.au.
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License

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