17% of Cognac vines non-bearing

Friday December 14 2018 by Vitisphere

“These important figures underscore the need for action by the industry at national level, through the National Plan for Grapevine Dieback”, claimed the Charente Plant Health Bulletin.“These important figures underscore the need for action by the industry at national level, through the National Plan for Grapevine Dieback”, claimed the Charente Plant Health Bulletin. - Photo credit : DR

Ranging from less than 1% to almost 45% depending on the location, the average percentage of non-bearing vines reached 16.8% in 2018 in the Charente wine regions, according to the latest observations of the grapevine trunk diseases observatory thrown up by its network of 27 plots. The “percentage is a combination of dead and missing vines, young plants less than a year old and vines seriously affected by Eutypa dieback, Esca or BDA”, said a recent memo from the Charente Plant Health Bulletin (BSV).

If intermediary vines aged three years and under are also included in the calculation, the percentage of non-bearing vines jumps to an average of 19.7%. This is equivalent to one in five vines not producing fruit, an estimate that confirms the willingness of Cognac winegrowers and trading companies to continue to renew their vineyards.

Replacements do not compensate for mortality

A closer look reveals that 10% of vines are dead or missing. “On average, vine replacements do not compensate for mortality (replacements are often done in “waves”), even if they increase from year to year with the age of the plots”, said the BSV. For grapevine trunk diseases, Esca and BDA symptoms totalled 6% on average this year. Dead arm was visible in 7% of the vines studied.

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