Results of monitoring of the population of Blumeria graminis f.sp. hordei in Latvia in 2009-2010

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Results of monitoring of the population of Blumeria graminis f.sp. hordei in Latvia in 2009-2010

In 2009-2010, random samples of the causal agent of barley powdery mildew were collected in Daugavpils (south-eastern Latvia, Latgale region), Stende (north-western Latvia, Kurzeme region) and Priekuļi (north-eastern Latvia, Vidzeme region). Virulence frequency, complexity and pathotypes were calculated in the pathogen populations. Significant differences of virulence detected by the genes Va1, Va3 and Va13 occurred among samples of the pathogen population collected in different parts of Latvia. Nei index, Müller's index, Kosman index, Shannon index and Simpson index showed considerably higher diversity in Daugavpils and Stende during 2009-2010. In Daugavpils, the population of Blumeria graminis f.sp. hordei was particularly characterised by high diversity.

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