South Africa Stem Rust Pathotypes

Predominant Pathotype(s): TTKSF – considered a progenitor of Ug99, avirulent on Sr31. Combined virulence to Sr31 + Sr24 is present in South Africa (race PTKST). Effective Sr Genes:Sr13, 22, 25, 26, 29, 32, 33, 35, 36, 37, 39, 42, 43, … Continue reading

South Africa Survey Mapper

The Country Survey Mapper tool, developed by the University of Aarhus Denmark, displays rust field survey data. Selection of any specific combination of year and disease is possible. Any new data incorporated into the underlying database will automatically be displayed … Continue reading

South Africa

Rust Issues: All 3 rusts are potential constraints. Stem rust historically was the major constraint. Yellow rust was first detected in 1996 – the result of a foreign incursion. Chemical control is undertaken. Ug99 Status: Four races in the Ug99 … Continue reading

20 March 2015: CAUTION – Increasing risk of stripe (yellow) rust outbreaks North Africa to South Asia

Favourable weather conditions for stripe rust are occurring across North Africa to South Asia. Cool, wet conditions across many parts of the region are producing a conducive environment for disease outbreaks. Aggressive races with virulence to Yr27 are known to … Continue reading

ALERT – Dec 23, 2013: LOCALIZED STEM RUST EPIDEMIC IN SOUTHERN ETHIOPIA. EXTREME CAUTION AND VIGILANCE NEEDED IN EAST AFRICA AND MIDDLE EAST REGION

A severe, localised stem rust epidemic has broken out in southern Ethiopia during November-December 2013. The districts of Agarfa and Gasera in Bale zone are the most seriously affected, but some spread into other areas is now being reported. The … Continue reading

Alert – Jan 9, 2015: Summary of Ethiopia 2014/15 rust situation. Re-current, localized stem rust epidemics caused by race TKTTF (“Digalu” race) in Ethiopia. Extreme caution and vigilance needed in East Africa

Following the localized stem rust epidemics in Ethiopia on the cultivar “Digalu” in 2013/14 (see report 23rd Dec 2013); continued, severe stem rust outbreaks have been observed in the 2014/15 main season. Once again the popular cultivar “Digalu” has been … Continue reading

May 17, 2013: CAUTION – POTENTIALLY SERIOUS OUTBREAKS OF YELLOW (STRIPE) RUST IN CWANA REGION. VIGILANCE NEEDED IN EAST AFRICA

Conducive climatic conditions for rusts, especially yellow rust, are resulting in potentially serious outbreaks in the CWANA region. Cool and wet conditions have persisted in many countries from Turkey to Bhutan. Early yellow rust infections have been observed in several … Continue reading