engleski

Screening of Croatian Grape Varieties to Downy Mildew Sensitivity

In spite of being a small country, Croatia presents an important source of grapevine biodiversity which can be interesting for wine industry and breeding. In last two decades our research activities are focused on preservation, genotyping and evaluation of production characteristics of native varieties. To define full potential of native varieties there is a need to define the level of their susceptibility to fungal diseases. The aim of this research was to define the level of susceptibility/resistance of Croatian grapevine varieties to downey mildew (Plasmopara viticola) using modified field screening method. Altogether 57 genotypes/varieties were included in the research: 52 Croatian native varieties, two susceptible international V. vinifera L. cultivars (Cabernet Sauvignon, Riesling), 2 resistant cultivars (Solaris, Regent) and 2 Vitis species (Vitis ripara, Vitis amurensis). Own-rooted cuttings were planted in drip irrigated pots in field conditions close to the production vineyard at experimental station “Jazbina”, Department of Viticulture and Enology, Faculty of Agriculture Zagreb. After initial growing of shoots to the certain stage the monitoring of disease symptoms was carried out according to OIV descriptor 452 (degree of resistance on leaves). Results showed small difference among native varieties and majority of them have very low and low level of resistance to downy mildew, as expected.

Grapevine, downy mildew, sensitivity, native varieties

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