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The Ug99 group of stem rust races (Puccinia graminis Pers. f. sp. tritici Eriks. & E. Henn.) has evolved and migrated. While the original variant overcame the widely deployed gene Sr31, and Sr21 (in Chinese Spring background), but not Sr21 in Einkorn, a new strain of Ug99, virulent on Sr24, was detected in 2006 and caused a severe epidemic in 2007 in Kenya. Forms virulent on Sr36 and Sr21 were...
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