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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.

Situation Update: Stem rust widespread in the highlands and west of Yemen

26 Apr 2011

Yemen: Wheat rust surveys undertaken by AREA, Yemen in the key wheat growing areas of the country during October 2010 to March 2011 revealed stem rust to be widespread in the highlands and western areas, but absent in the eastern regions around Seiyun. Of the 33 fields surveyed in the highlands and west of the country in October 2010, stem rust was recorded in 27 (82%) of the fields. Disease severity was high to moderate (>20%) in 13 fields. In contrast stem rust was completely absent from the eastern regions around Seiyun in surveys undertaken in Feb-Mar 2011. Stem rust races present in Yemen during 2010/11 are currently unknown, but samples are undergoing analysis.


Situation Update: Ug99 lineage races TTKSK (Ug99), TTKST (Ug99+Sr24) and TTTSK (Ug99+Sr36) confirmed in Tanzania

5 Apr 2011

Three variants in the Ug99 lineage have been confirmed in stem rust samples collected in Tanzania during August 2009 by a team of Tanzanian and international scientists. Races confirmed by the USDA‐ARS Cereal Disease Laboratory, St. Paul, MN, USA were; TTKSK (Ug99), TTKST (Sr24 variant of Ug99) and TTTSK (Sr36 variant of Ug99). Races TTKSK and TTTSK were present in samples from the Hanang, and Ngorongoro areas, whilst race TTKST was present in the Karatu and Monduli areas (Lowe et al forthcoming). All three races have been present in neighbouring Kenya since 2001, 2006, and 2007 respectively. Given the close proximity of wheat areas in Kenya and Uganda known to be infected by stem rust Ug99, and observed regional wind patterns, the results from Tanzania are not unexpected. No crop damage was observed in Tanzania in 2009 due to stem rust. A combination of effective chemical control and early senescence due to drought resulted in the majority of wheat fields surveyed being rust-free apart from a few isolated infected plants. These confirmed results support previous findings which indicate the expected and continued regional spread of Ug99 variants out of Kenya.

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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)