Structural changes in virulence of wheat powdery mildew (Erysiphe graminis f. sp. tritici) populations in Slovakia in 1994-1995
1996
Svec, M. | Miklovicova, M. (Komensky Univ., Bratislava (Slovakia). Prirodovedecka Fakulta)
The structure of virulence of wheat powdery mildew populations (Erysiphe graminis DC f. sp. tritici Marchal) from different regions of Slovakia against 14 resistance genes was observed in 1994 and 1995. In 1994 a total of 149 isolates from five localities and in 1995 a total of 201 isolates of wheat powdery mildew from six localities were tested. The categorization of resistance genes for effectiveness was the same in both 1994 and 1995. The effectiveness of the Pm5, Pm7, Pm8 and Ml-i genes was lost over the whole of the Slovak Republic. Considering the results in both years it is possible to adjoin the Pm6 gene, which was partially effective in the last year, to the group of ineffective genes. The lowest virulence so far has been established against Pm3b, Ml-d and Pm9 genes in Slovakia. The virulence patterns of wheat powdery mildew populations stabilized during 1994 and 1995. Further development of the virulence will depend on selection pressure created by new varieties with incorporated genes of specific resistance
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