Downy mildew of grapevine, caused by a fungal pathogen Plasmopara viticola (B. et C.) Berl. et de T., is one of the most widespread and destructive vineyard diseases all over the world. The degree of resistance or, on the contrary, susceptibility to P. viticola is usually very low in the different cultivars of Vitis vinifera. This research aimed at evaluating the degree of resistance to downy mildew causal agent in Georgian autochthonous grapevine cultivars in the framework of COST Action FA1003 ("East-West Collaboration for Grapevine Diversity Exploration and Mobilization of Adaptive Traits for Breeding"). The laboratory leaf disk technique according to OIV 452-1 descriptor was used for screening 50 different native cultivars of Georgia (the Caucasus). Screened cultivars demonstrated different degree of resistance: very high resistance revealed 4 accessions, high - 13, medium - 12, little - 16 and very little - 5 accessions. These results give optimistic information to repeat the test in the next vegetative year for these selective accessions and continue the screening of new cultivars for searching resistant genotypes within the Georgian germplasm.
Screening of the Georgian grape germplasm to susceptibility of downy mildew: preliminary results / N. Bitsadze, R. Chipashvili, L. Tskhvedadze, M. Aznarashvili, D. Maghradze, A. Vercesi, O. Failla. - In: ACTA HORTICULTURAE. - ISSN 0567-7572. - :1032(2014), pp. 191-196. ((Intervento presentato al convegno I International Symposium on Fruit Culture and Its Traditional Knowledge along Silk Road Countries tenutosi a Yerevan nel 2013.
Screening of the Georgian grape germplasm to susceptibility of downy mildew: preliminary results
A. VercesiPenultimo
;O. Failla
2014
Abstract
Downy mildew of grapevine, caused by a fungal pathogen Plasmopara viticola (B. et C.) Berl. et de T., is one of the most widespread and destructive vineyard diseases all over the world. The degree of resistance or, on the contrary, susceptibility to P. viticola is usually very low in the different cultivars of Vitis vinifera. This research aimed at evaluating the degree of resistance to downy mildew causal agent in Georgian autochthonous grapevine cultivars in the framework of COST Action FA1003 ("East-West Collaboration for Grapevine Diversity Exploration and Mobilization of Adaptive Traits for Breeding"). The laboratory leaf disk technique according to OIV 452-1 descriptor was used for screening 50 different native cultivars of Georgia (the Caucasus). Screened cultivars demonstrated different degree of resistance: very high resistance revealed 4 accessions, high - 13, medium - 12, little - 16 and very little - 5 accessions. These results give optimistic information to repeat the test in the next vegetative year for these selective accessions and continue the screening of new cultivars for searching resistant genotypes within the Georgian germplasm.
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