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Quantitative determination of the fungal populations in grape berries ecological aspects

Quantitative determination of the fungal populations in grape berries ecological aspects

Connaissance de la Vigne et du Vin 24(3): 125-132, 145

Our previous results have shown that botryticides increase the frequency of strains from Cladosporium genus, which according to laccase synthesis exceed the strains of Botrytis cinerea. In 1988 investigations were carried with grape berries of four grape sorts : traminac, riesling, sirmium and neoplanta. The obtained results proved that, except traminac, 40-50 p. cent of total fungal populations belonged to Botrytis cinerea. Regeneration of this strain is due to the widespread resistent strains. Cladosporium is present in 10-13 p. cent. This indicates that, in spite of its cosmopolitism, the biological capacity is insufficient for its existence together with Botrytis cinerea. Alternaria which was hardly registered up to now, indicates the presence of 20-25 p. cent. Frequencies of some belonging to Deuteromycotina group are also increased. Domination of particular population ought to be a part of a routine control in order to avoid application of those chemical agents for which the resistence of particular strains are know, as their application will only increase the environment pollution and not protect the grape berries.

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