Stem rust (barley)

Stem rust is a fungal disease of barley caused by "Puccinia graminis" f.sp. "tritici" and "Puccinia graminis" f.sp. "secalis".cite book
last = Mathre
first = D.E.
title = Compendium of barley diseases
publisher = American Phytopathological Society
date = 1997
pages = 120 pp ] cite book
last = Martens
first = J.W.
coauthors = W.L. Seaman, T.G. Atkinson
title = Diseases of field crops in Canada
publisher = Canadian Phytopathological Society
date = 1984
pages = 160 pp ]

Symptoms

Leaf rust is characterized by large pustules that are oval to elongated and are often surrounded by a characteristic torn margin. The red rust or summer spore stage (uredinia) is evident on stems, leaf sheaths, glumes, awns, and leaves as elongate pustules containing reddish brown spore masses which fall away easily. The black rust or autumn spore stage (telia) looks like the red stage except for the black color, but do not dislodge.

Disease cycle

Stem rust survives the summer mainly on volunteer wheat, barley, triticale and some grasses including common wheat grass and barley grass. Barberry species ("Berberis vulgaris". "B. canadensis", "B. fendleri") serve as an alternate host for "Puccinia graminis".

Spores are spread by wind to susceptible hosts. High humidity and heavy dew favour development of the disease which develops rapidly at temperatures near 20°C. Disease development s markedly reduced by temperatures below 15°C and above 40°C.

External links

Extension publications

* [http://plant-disease.ippc.orst.edu/disease.cfm?RecordID=115 US: Oregon]
* [http://www.dpi.vic.gov.au/dpi/nreninf.nsf/childdocs/-22C871BE2A0105794A2568B30004D413-3C5B474B480825C8CA256BC700824574-78F1BBD6496F89034A256DEA00274EEC-FC12E4D8B8736B23CA256CF7000B0281?open Australia]

Research articles

cite journal
last = Dill-Macky
first = R.
coauthors = A. P. Roelfs
title = The effect of stand density on the development of Puccinia graminis f. sp. tritici in barley
journal = Plant Dis.
volume = 84
pages = 29–34
date = 2000
url = http://www.apsnet.org/pd/pdfs/1999/1022-02R.pdf
doi = 10.1094/PDIS.2000.84.1.29

cite journal
last = Dill-Macky
first = R.
coauthors = A.P. Roelfs
title = The effect of race QCCJ of Puccinia graminis f. sp. tritici on yield and quality in barley
journal = Plant Dis.
volume = 82
pages = 674–678
date = 2006
url = http://www.apsnet.org/phyto/search/2006/phyto-96-0941.asp
doi = 10.1094/PDIS.1998.82.6.674

cite journal
last = Kilian
first = A.
coauthors = B. J. Steffenson, M. A. Saghai Maroof
title = RFLP Markers Linked to the Durable Stem Rust Resistance Gene Rpg1 in Barley
journal = MPMI
volume = 7
pages = 298–301
date = 1994
url = http://www.apsnet.org/mpmi/pdfs/1994/Microbe07-298.pdf

cite journal
last = Liu
first = J.Q.
coauthors = D.E. Harder, J.A. Kolmer
title = Competitive ability of races of Puccinia graminis f. sp. tritici on three barley cultivars and a susceptible wheat cultivar
journal = Phytopathology
volume = 86
pages = 627–632
date = 1996
url = http://www.apsnet.org/phyto/PDFS/1996/Phyto86n06_627.PDF
doi = 10.1094/Phyto-86-627

cite journal
last = Martens
first = J.W.
coauthors = G.J. Green, K.W. Buchannon
title = Inheritance of resistance to Puccinia graminis f. sp. avenae in a Hordeum vulgare selection
journal = CJPP
volume = 5
pages = 266–268
date = 1983
url = http://www.cps-scp.ca/download/cjpp-archive/Vol5/CJPP5(4)266-268(1983).pdf

cite journal
last = Steffenson
first = B.J.
coauthors = R.D. Wilcoxson
title = Receptivity of barley to Puccinia graminis f. sp. tritici
journal = CJPP
volume = 9
pages = 36–40
date = 1987
url = http://www.cps-scp.ca/download/cjpp-archive/Vol9/CJPP9(1)36-40(1987).pdf

cite journal
last = Sun
first = Yongliang
coauthors = Brian J. Steffenson, Yue Jin
title = Genetics of resistance to Puccinia graminis f. sp. secalis in barley line Q21861
journal = Phytopathology
volume = 86
pages = 1299–1302
date = 1996
url = http://www.apsnet.org/phyto/PDFS/1996/Phyto86n12_1299.PDF
doi = 10.1094/Phyto-86-1299

References