Wheat leaf rust races/pathotypes in the Czech Republic in 1999–2000

Abstract

In 1999–2000 virulence of the wheat leaf rust population was studied on Thatcher near isogenic lines (NILs) with  Lr1, Lr2a, Lr2b, Lr2c, Lr3, Lr9, Lr10 (only in 2000), Lr11, Lr15, Lr17, Lr19, Lr21, Lr23, Lr24, Lr26 and Lr28. On these NILs 11 pathotypes were determined in 1999, and 18 in 2000. All rust samples were avirulent on Lr9, Lr19, Lr24 and Lr28. There was a relatively low frequency of virulence on Lr1, Lr2a and Lr2b. Most rust samples were virulent on Lr2c, Lr11, Lr15, Lr17, Lr21, Lr23 and Lr26. The identified pathotypes conformed with races 61SaBa, 77SaBa, 2SaBa, 12SaBa, 57SaBa, 6SaBa, 28SaBa, 61and 6. Races 61SaBa, 2SaBa and 77SaBa prevailed in 1999, races 61SaBa and 12SaBa were prevalent in 2000. Race 28SaBa was found for the first time. Data of the reactions to 15 leaf rust isolates of the recently registered winter wheat cultivars Niagara, Vlasta, Sulamit, Record, Ludwig, Apache, Semper, Drifter, Complet, Corsaire, Sepstra and Rialto are presented.