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Barley Stripe Rust

Scientific Name
Puccinia striiformis f. sp. hordei
Scientific Author
Westend.
Taxonomy
Urediniomycetes, Uredinales
Status
Exotic species - absent from Australia
Reliability
High
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Diagnostic Images

Urediniospores
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Caption
for use contact [email protected]
Source
A.R. McTaggart Department of Primary Industries and Fisheries
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Diagnostic Images (7)
Diagnostic Notes

Symptoms

Bright orange-yellow uredinia coalesce to form linear, chlorotic streaks down leaf surfaces. The uredinia are restricted by leaf veins and appear as yellow stripes on the leaf.

 

 

The fungus:

Pycnia and aecia unknown. Uredinia amphigenous on sheaths, culms and inflorescence; usually not confluent, 0·5–1 × 0·3–4 mm; with peripheral cylindrical or mostly saccate or saccate-capitate paraphyses (12–25(–30) diam.) that collapse readily; forming yellow lines of disease areas appearing as chlorotic streaks, up to 70 mm long. Urediospores globose to ellipsoid, (20–)25–30(–34) × 12–24(–26) µm; contents orange; wall hyaline, 1.5(–2) µm thick, with short spines, spines 1·5 µm apart, pores scattered, indistinct, 8–10(–14). Telia on abaxial leaf surface and sheaths in lines or scattered on the inflorescence, brown to black; sub-epidermal paraphyses separate spores into groups forming a compound sorus. Teliospores deep golden brown or chestnut-brown, clavoid, truncate or obliquely conical above, slightly constricted, attenuate below, 30–70 × (12–)16–24 µm; wall brown, smooth, 4–6(–10) µm thick at the apex; pedicel short, 15 µm long, slightly coloured. Mesospores sometimes present, 26–32 × 12–16 µm (Cummins 1971; Mulder & Booth 1971).

More Information
Author
McTaggart, A.
Created
15/10/2007 04:54 AEST
Last Updated
09/02/2009 12:52 AEST
Citation
McTaggart, A. (2007) Barley Stripe Rust (Puccinia striiformis f. sp. hordei) Updated on 2/9/2009 12:52:36 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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