Four disease-resistant varieties similar to Ugni blanc available in 2021

Thursday April 11 2019 by Vitisphere

Gérald Ferrari, from the BNIC, presented the characteristics of the four disease-resistant varieties similar to Ugni blanc.Gérald Ferrari, from the BNIC, presented the characteristics of the four disease-resistant varieties similar to Ugni blanc. - Photo credit : DR

Cognac winegrowers may soon have four new grape varieties resistant to mildew and powdery mildew, similar to Ugni blanc. The cultivars come from the first selection programme for disease-resistant grape varieties run by the Cognac marketing bureau BNIC. They are the result of crosses between a Bouquet variety (RV4) and Ugni blanc that were performed in 2003.

They are due to be listed in the official catalogue of vine varieties and classified for wine production in 2021; production of standard plants will be allowed starting 2021. For certified material, basic plants could be available to nurseries by 2022”, explained Gérald Ferrari of the BNIC, on 29 March at the Lien de la Vigne’s AGM in Paris.

Monogenic varieties

The four varieties are monogenic disease-resistant varieties, i.e. they carry only one downy mildew resistance gene and one powdery mildew resistance gene. “They have complete resistance to powdery mildew. Their resistance to downy mildew is partial but high. In 2018, a year of high disease pressure, there were nevertheless some crop losses. Their sensitivity to black-rot is variable. Their sensitivity to botrytis is slightly higher than for Ugni Blanc. Their productivity is high. They produce a lot of large clusters”, explained Gérald Ferrari. He believes the varieties will still need to receive minimal fungicide protection to limit crop losses and avoid bypassing resistance.

 

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