The Behaviour of Some Grapevine Varieties to the Guignardia bidwellii Fungus Attack

Abstract

Guignardia bidwellii or black rot of vine is one of the most dangerous diseases that occur in vineyards in the center of Transylvania. The objective of this work was the tolerance testing of varieties and clones homologated at SCDVV Blaj to the Guignardia bidwellii attack. The behavior of vine varieties to the Guignardia bidwellii fungus attack was characterized by the analysis of the severity of the symptoms according to a scale in function of the attack degree (AD). The results obtained revealed the tolerance of the tested varieties: ‘Rubin’ (AD=0.13%), ‘Amurg’ (AD=0.25%), ‘Brumariu’ (AD=0.78%), ‘Radames’ (AD=0.96%) and ‘Blasius’ (AD=0.97%), a medium tolerance presented ‘Selena’ (AD=9.28%) variety and ‘Neuburger-10 Bl’ (AD=5.04%), ‘Iordana 9-1 Bl’ (AD=6.40%), ‘Riesling de Rhin 7-2’ (AD=7.2%), ‘Sauvignon-9 Bl’ (AD=9.28%), ‘Traminer roz-60 B’ clones (AD=17.5%) and susceptibility for ‘Astra’ variety (AD=25.56%) and ‘Riesling italian-3 Bl’ (AD=22.4%), ‘Pinot gris-34 Bl’ (AD=30.60%), ‘Feteasca regala-21 Bl’ (AD=31.50%), ‘Muscat Ottonel-12Bl’ (AD=35.30%), ‘Feteasca alba-29 Bl’ clones (AD=38.40%). The results obtained regarding the behavior of grapevine in the climatic conditions specific to the studied area for the 2016-2018 period, show that the lowest values of AD were registered for the ‘Rubin’ (AD=0.13%), ‘Amurg’ (AD=0.25%), ‘Brumariu’ (AD=0.78%), ‘Radames’ (AD=0.96%) and ‘Blasius’ (AD=0.97%) varieties homologated at SCDVV Blaj.

Keywords

• attack degree
• black rot
• tolerant varieties.