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Search for "VESELÝ D.": 2 articles found.
VESELÝ D. (1977): Pilze der Gattung Alternaria Nees ex Wallr., die am Wurzelbrand der Zuckerruben beteiligt sind. Česká Mykologie 31(2): 100-107 (published: 1977)
abstract
Besides the already known pathogen of the sugar beet damping-off, Alternaria tenuis Nees, four other species of the genus Alternaria are involved in this disease: Alternaria tenuissima (Kunze ex Pers.) Wiltshire, Alternaria dendritica (de S. da Cam.) Joly, Alternaria harzii Joly, and Alternaria chartarum Preuss. Sugar beet seeds were colonized only by A. tenuissima and A. tenuis. In the rhizosphere soil of sugar beet, A. tenuissima and A. tenuis were predominant. The species A. dendritica, A. harzii and A. chartarum were represented to a lesser extent than the two previous species. In open soil, only A. tenuis and A. tenuissima were found. In contrast to the rhizosphere soil, only a small number of colonies could be obtained from the open soil. From plants affected by damping-off, the species A. tenuissima, A. tenuis, A. dendritica and A. harzii were isolated. Pathogenicity tests have shown that these species are only weakly pathogenic to germinating sugar beet.
VESELÝ D. (1977): Das Vorkommen von Pythium oligandrum Drechsler auf der Wurzeloberfläche auflaufender Zuckerrüben in Böhmen und einige Erkenntnisse zur Biologie des Pilzes. Česká Mykologie 31(1): 41-51 (published: 1977)
abstract
During investigations of colonization of healthy emerged sugar beet roots by microorganisms, the fungus Pythium oligandrum Drechsler was found on the root surface of sugar beet seedlings which already had true leaves, in Semčice (Central Bohemia) in 1972. Infection tests proved a low degree of pathogenicity of this fungus towards sugar beet seedlings. In laboratory conditions, Pythium oligandrum showed strong parasitism against Pythium ultimum Trow and Pythium debaryanum (Hesse) De By., which are significant root rot pathogens of sugar beet. In dual cultures with these fungi, P. oligandrum usually dominated the substrate within 24 hours after inoculation and completely destroyed or strongly suppressed the other fungus growing with it on agar medium. Because Pythium oligandrum exhibits only very weak pathogenicity towards sugar beet but is a strong parasite of P. ultimum and P. debaryanum, which it shares the rhizosphere with, its potential use for biological control of sugar beet root rot is discussed, using biopreparations applied to sugar beet seed.
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