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Vine run-off

In spring, if the weather conditions are unfavorable during flowering, the flowers abort without giving seeds: this is the coulure of the vine.

See also millerandage.

The Merlot grape variety is particularly sensitive to coulure, which can cause severe harvest losses.

Coulure de la vigne sur cépage merlot

This bunch of merlot was strongly affected by the coulure of the vine.
Only a few seeds developed.
Photo taken on August 17, 2010, 4 to 5 weeks before the harvest.