View source for Puccinia hordei

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[[File:IPMimage5410684.jpg|250px|thumb|''Puccinia hordei'' symptoms on wheat (click to enlarge)<br/>Author(s): Donald Groth, Louisiana State University AgCenter<br/>Source: [http://www.ipmimages.org/browse/detail.cfm?imgnum=5410684 IPM Images]]]
<font color="#800000">'''''Puccinia hordei'''''</font> G.H. Otth 1870 - (brown rust of barley)

The fungus has a worldwide distribution and is common on barley during warm and dry years. Infections are characterized by round, brownish to orange uredia on both surfaces of the leaves. Yield losses of around 10% have been reported, but can also reach of up to 60% in some countries. In Australia alone, annual yield losses due to the pathogen have been estimated at $ 21 million.
[[File:Puccinia hordei G.H. Otth 5410686.jpg|250px|left|thumb|''Puccinia hordei'' aecidiospores (click to enlarge)<br/>Author(s): Donald Groth, Louisiana State University AgCenter<br/>Source: [http://commons.wikimedia.org/wiki/File:Puccinia_hordei_G.H._Otth_5410686.jpg Wikimedia Commons]]]
Management involves the use of resistant cultivars. However, new, resistant-breaking  pathotypes are emerging. The fungus is air-borne and overwinters on alternate hosts or on winter barley.

Urediniospores are elliptical and measure approximately 20-30 x 20 µm. Teliospores are brown to black and approximately 46 x 22 µm large. Basidiospores have a size of 12 x 7 µm.
{{VN
|en=brown rust of barley<br/>leaf rust of barley<br/>barley leaf rust
|de=Zwergrost der Gerste<br/>Gerstenbraunrost<br/>Braunrost der Gerste
|fr=rouille brune de l'orge<br/>rouille naine de l'orge
|es=roya enana de la cebada
}}
Sexual reproduction occurs on species of ''Ornithogalum'' or other Liliaceae. The pycniospores are about 4 x 2 µm large. Aecia are globose with a round opening. Aeciospores are nearly spherical, about 20-25 µm in diameter. 

'''Synonyms:'''<br/>
''Puccinia simplex''

For a review see [[Annual Review of Phytopathology (2015) 53, 565-589|Park et al. (2015)]].

[[Category:Puccinia (genus)]]