Pathogenicity of barley powdery mildew (Blumeria graminis f. sp. hordei) in Poland in 2000
Henryk J. Czembor
h.czembor@ihar.edu.plInstytut Hodowli i Aklimatyzacji Roślin, Radzików (Poland)
Jerzy H. Czembor
Instytut Hodowli i Aklimatyzacji Roślin, Radzików (Poland)
Abstract
Pathogenicity of barley powdery mildew (B. graminis f. sp. hordei) was investigated in Poland in 2000. In this investigation leaf samples of susceptible cultivar Manchuria, infected by powdery mildew collected in 12 locations, were used. From leaf samples collected in each location 20 single — spore isolates were obtained. Virulence of specific single — spore isolates was determined based on their resistance reaction on 32 differential cultivars. Virulences Vg + CP (99.0%), Va7 + Ab (99.5%), Vh (99.5%), V(La) (100%), V(Ru2) (100%), V(Bo) (98%), Vra (100%), V(Kr) +? (90%) were present in Poland in 2000 with frequency more than 90%. Virulences which were present with low frequency (below 50%) were: Va1 +? (37%), V(St1) + St2 (29%), Vat (47%), Va9 + k (41.5%), Va3 (40,5%), Va22 (47%), Va7+ k +? (42.5%) and Vp (0.5%). Virulences Va23 and Vo5 were not present. In 2000 the strong influence of population of B. graminis f. sp. hordei from neighbouring countries was observed on V(Bo) and V(La) frequencies. Virulences Va3, V(St1) + St2, Va1 and Va3+ Tu2 were present in population of barley powdery mildew in Poland in spite of their corresponding resistances have not been used in cultivars grown in Poland in 2000.
Keywords:
Blumeria graminis f. sp. hordei, barley, pathogenicity, virulence analysisReferences
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Authors
Henryk J. Czemborh.czembor@ihar.edu.pl
Instytut Hodowli i Aklimatyzacji Roślin, Radzików Poland
Authors
Jerzy H. CzemborInstytut Hodowli i Aklimatyzacji Roślin, Radzików Poland
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