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Neojohnstonia colocasiae

Scientific Name
Neojohnstonia colocasiae
Scientific Author
(M.B. Ellis) B. Sutton
Taxonomy
(Ascomycota: Pezizomycetes)
Pest Status
2 NZ - Regulated pest
Status
0 NZ - Unknown
Reliability
High
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Diagnostic Images

In Life
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Caption
Neojohnstonia colocasiae symptoms on upper surface of leaf
Source
E. McKenzie Landcare Research
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Diagnostic Images (3)
Diagnostic Notes
Disease

Orange leaf spot. Spots on older leaves, yellowish brown, circular or irregular blotches on either leaf surface, becoming darker with onset of sporulation; sometimes surrounded by a yellow halo, or with a brown border. Spots up to 15 mm diam., but smaller when there are many spots on the one leaf.

Morphology

Conidiophores up to 150 µm long, 2–5 µm thick, much branched, ending in conidiogenous cells that each bear a short denticle on which the conidia are borne, septate, pale brown to olivaceous-brown, flexuous, smooth. Conidia 9–11 × 7.5–10 µm, 1–3-septate, pale brown, verruculose, broadly ellipsoidal or subspherical, solitary.

Notes

Disease symptoms are very similar to those of ghost spot caused by Cladosporium colocasiae.

More Information
Specimen Contact
Eric McKenzie
Author
McKenzie, E.
Created
16/07/2013 10:17 AEST
Last Updated
15/04/2014 01:10 AEST
Citation
McKenzie, E. (2013) Neojohnstonia colocasiae (Neojohnstonia colocasiae) Updated on 4/15/2014 1:10:23 AM 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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