Natural Parasitism of Uncinula necator Cleistothecia by Ampelomyces Hyperparasites in the South-Western Vineyards of Hungary

Füzi, I. (2003) Natural Parasitism of Uncinula necator Cleistothecia by Ampelomyces Hyperparasites in the South-Western Vineyards of Hungary. Acta Phytopathologica et Entomologica Hungarica, 38 (1-2). pp. 53-60. ISSN 0238-1249

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Abstract

The natural occurrence of Ampelomyces hyperparasites was determined in Uncinula necator cleistothecia in nine south-western vineyards of Hungary between 1997-2000. During this study, a total of 1600 grape leaf samples were collected and examined from seven grapevine cultivars. The results showed that Ampelomyces spp. were widespread in that area and parasitized 0-55.7% (mean: 8.3%) of the cleistothecia on the adaxial surface of the leaves and only 0-4.8% (mean: 0.8%) on the abaxial leaf surfaces. The incidence of Ampelomyces in U. necator cleistothecia was the highest on the leaves covered more than 60% with powdery mildew mycelia. The results suggested that the naturally occurring Ampelomyces hyperparasites play a role in the natural control of grapevine powdery mildew and may reduce the overwintering inoculum of U. necator in the studied area.

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