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Maize leaf blight

Scientific Name
Exserohilum turcicum
Scientific Author
(Pass.) K.J. Leonard & Suggs
Taxonomy
(Ascomycota: Dothideomycetes: Pleosporales: Pleosporaceae)
Risk
Medium
Status
Exotic Disease Occurence in Thailand
Reliability
High
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Diagnostic Notes

Ascomata black, globose to elliptical, 350-725 x 345-500 µm, ostiolate. The ostiole and the upper surface of the ascomata are provided with rigid, dark brown, thick-walled, septate setae which measure up to 150 µm long, 4-6 µm thick. Pseudoparaphyses filiform, hyaline, septate, branched, anastomosing. Asci cylindric-clavate, short pedicellate, bitunicat, thick-walled when young, 1-8 spored, 175-250 x 24-31 µm. Ascospores hyaline, fusoid, 1-6 (mostly 3) –septate, constricted at the septa, straight to slightly curved, 40-78 x 12-18 µm, surrounded by a thin, hyaline mucilaginous sheath which may extend beyond the ends of the spore after discharge.


Conodiophores single or in small groups, simple, cylindrical, olivaceous brown, paler towards the apex, geniculate above, up to 300 µm long, 8-10 µm thick. Conidia ellipsoidal to obcavate, pale to olivaceous brown, straight to slightly curved, smooth, 4-9 distoseptate, 50-144 x 18-33 µm with a distinct protuberant hilum. (Description taken from Sivanesan, 1987).

More Information
Specimen Contact
Wanich Khampanich
Author
Khampanich, W., Beasley, D.R. & Shivas, R.G.
Created
31/01/2011 05:21 AEST
Last Updated
01/02/2011 17:48 AEST
Citation
Khampanich, W., Beasley, D.R. & Shivas, R.G. (2011) Maize leaf blight (Exserohilum turcicum) Updated on 2/1/2011 5:48:23 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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