New molecular diagnostic assays are providing rapid and useful information on the Ug99 race group in Africa. The assays have been developed by the group led by Dr Les Szabo at the USDA-ARS Cereals Disease Laboratory in St Paul, Minnesota, … Continue reading
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Effective / Ineffective stem rust Resistance Genes The following table summarizes the effective and ineffective stem rust resistance genes for races in the Ug99 lineage (based on Singh et al., 2006). TTKSK (Ug99) TTKSF TTKST (Ug99 + Sr24) TTTSK (Ug99 … Continue reading
Differential sets are a vital component of race analysis. The aim is to have a set of differential varieties, ideally each with a different single resistance gene, which can distinguish races by their qualitative differences in reactions to different pathogen … Continue reading
Status Summary: Ug99 Lineage – September 2021 Race TTKSK (Ug99) was the first known race of P. graminis f. sp. tritici with virulence to the stem rust resistance gene Sr31. It also possesses virulence to a wide range of resistance … Continue reading
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; … Continue reading
Survey updates – East Africa Kenya: stem rust incidence and severity is very high in Kenya. Recent surveys (June 2010) by KARI,Njoro staff in the Narok region recorded stem rust in 80% of the 109 fields surveyed. Stem rust severity … Continue reading
Confirmed results from race analysis completed in the 2009/10 season are now available. The confirmed spread of Ug99 variants carrying combined Sr31 + Sr24 virulence in Africa continues, along with the continued predominance of these variants in Kenya. The absence … Continue reading
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 … Continue reading
East Africa: In Uganda, high incidence and severity of wheat stem rust have been reported in late August throughout the wheat growing regions. In Kenya, despite drought in many areas, wheat stem rust has been recorded throughout the wheat areas. … Continue reading