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Powdery mildew of Sesame

Scientific Name
Oidium violae
Scientific Author
Pass.
Taxonomy
(Ascomycota: Ascomycetes: Erysiphales: Erysiphaceae)
Risk
Medium
Status
Exotic Pest Occurence in Thailand
Reliability
High
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Diagnostic Images

Conidia
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Caption
Conidia of Oidium violae. Scale bar = 10 µm
Source
Supatra Intavimolsr Department of Agriculture, Thailand
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Diagnostic Images (4)
Diagnostic Notes

Mycelium amphigenous, effuse or patches, evanescent to pesistent, hyphae slightly flexous, branched at right angles, ca 5-7 µm wide, appressoria nipple-shaped, often poorly developed, conidiophores simple, erect, foot-cells straight or often curved below, ca 40-100 x 10-13 µm, followed by 1-3 shorter cells, about 10-25 x 11-14 µm, sometimes longer, conidia in chains, chain usually not very long, spore units not conspicuously swollen, conidia ellipsoid-ovoid to doliform-subcylindric, ca 25-40 x 15-23 µm, l/w ratio usually somewhat below 2, germ tubes arising from an end of the spore, occasionally from a side, usually fairly short, about as long as the conidia or shorter, sometimes twisted, broadened, sometimes straight, bent or helicoids, terminating in a slightly swollen appresorium. Description taken from Braun (1987).

More Information
Specimen Contact
Supatra Intavimolsri
Author
Intavimolsri, S., Srichart, W., Beasley, D.R., Shivas, R.G. (2011)
Created
01/02/2011 04:34 AEST
Last Updated
25/02/2011 15:15 AEST
Citation
Intavimolsri, S., Srichart, W., Beasley, D.R., Shivas, R.G. (2011) (2011) Powdery mildew of Sesame (Oidium violae) Updated on 2/25/2011 3:15:32 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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