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Rust Report - Stem (Black) Rust

Regularly updated situation reports on cereal rusts based on information provided by a global network of rust workers. It is important to note that not all reports of stem rust relate to Ug99 or variants - other local races are also included.

Wheat Stem Rust - Previous Report

17 May 2010

Ug99 Lineage Race PTKST (virulent to Sr31 and Sr24) confirmed in South Africa

A stem rust sample collected from near Greytown, KwaZulu-Natal, South Africa in Nov. 2009 has been confirmed to be Ug99 lineage race PTKST. Samples from another site - Cedara, KwaZulu-Natal, collected in Dec. 2009 showed similar virulence profiles. The confirmed findings have just been published in Plant Disease by Pretorius et al (2010). Race PTKST was only previously known from Kenya, where it was detected in 2008. Race PTKST is notable in that it carries combined virulence for resistance genes Sr24 and Sr31. The published avirulence/virulence profile of race PTKST is:

Avirulent: Sr13, 14, 21, 22, 25, 26, 27, 29, 32, 33, 35, 36, 37, 39, 42, 43, 44, Em, Tmp, and Satu

Virulent: Sr5, 6, 7b, 8a, 8b, 9a, 9b, 9d, 9e, 9g, 10, 11, 16, 17, 24, 30, 31, 34, 38, 41, and McN.

In seedling tests, 59 out of 103 South African cultivars tested were susceptible to race PTKST. It is believed that PTKST may be an exotic introduction into South Africa rather than a single –step mutation from local stem rust races.


Stem Rust Undetected in Iraq Field Surveys, March-April 2010

14 May 2010

Stem Rust Undetected in Iraq Field Surveys, March-April 2010

Field surveys undertaken in the main wheat growing governorates in Iraq during March-April 2010 did not detect any stem rust. A total of 18 farmer field sites distributed throughout the country were surveyed (see country map). Stem rust was not recorded at any of the survey sites.

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Rust SPORE is developed by FAO and partners as part of the Borlaug Global Rust Initiative (BGRI) to mitigate the threat of wheat rust diseases (stem rust, leaf rust and yellow rust).


The designations employed and the presentation of material in this information product do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organization of the United Nations (FAO) concerning the legal or development status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.

Latest Updates

2010 rust surveys
2010 Rust Surveys - Stem Rust Severity (Click to access smart PDF)
Wind trajectories
Wind Trajectories 25/02/2011 (Click for larger view)