Plant Protect. Sci., 2011, 47(2):43-51 | DOI: 10.17221/44/2010-PPS

Changes in the population of Blumeria graminis f.sp. hordei in the Czech Republic from 2009 to 2010

Antonín DREISEITL
Agrotest fyto Ltd., Kroměříž, Czech Republic

Virulences to powdery mildew resistances in barley cultivars mostly carrying unknown resistances were determined in 2009 and 2010. Random spore samples of the airborne pathogen populations originating from winter and spring barley fields were obtained by means of a mobile version of a jet spore sampler by travelling across theCzech Republic. In total 301 isolates were studied, 55 differentials carrying mostly unknown resistances were used and 80 pathotypes were found, of which 26 representing 73.1% of isolates were detected in both years. Virulence frequencies showed a wide range from 0% to 100%. Complexity of the 2010 population slightly increased, mostly due to increasing frequencies of virulence to new resistances, whereas the complexity of virulences to resistances in most other differentials decreased. Pathotype 00027 was the most abundant (10.0%). Diversity of the 2010 population considerably increased due to changes in virulence frequencies.

Keywords: barley; Hordeum vulgare L.; powdery mildew resistances; pathogen population; virulence frequencies; diversity parameters

Published: June 30, 2011  Show citation

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DREISEITL A. Changes in the population of Blumeria graminis f.sp. hordei in the Czech Republic from 2009 to 2010. Plant Protect. Sci. 2011;47(2):43-51. doi: 10.17221/44/2010-PPS.
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