Several definitions exist to characterize grape berry maturity: technological, aromatic, polyphenolic, and enological:   Technological maturity is the time point beyond which berries do not accumulate more sugar and do not lose any more acidity. Phenolic maturity takes into account the quantitative and qualitative evolution of the berry polyphenols in the skin (anthocyanin […]

As we enter veraison, we observe that the window during which berries are changing color is stretching due to the weather cooling off. What does this mean for the uniformity of ripening? Traditionally it is assumed  that the rate of ripening is uniform between berries. Consequently, when a berry turns […]

Highlights of the Xth Terroir Congress (7/7 – 7/10) in Tokaj, Hungary At Terroir Congress, participants from all over the world discussed the most recent findings in viticulture. Attendees came from diverse backgrounds (PhD students, UNESCO and OIV members, vineyard owners, full-time researchers or winemakers) and from diverse fields (viticulture, […]

The purpose of this discussion is to sharpen critical views of new methods as they arise. It aims at understanding the limitations and benefits of new techniques to improve our ability to optimize water use. Surface renewal (SR) is an interesting and powerful method, particularly for large acreage showing a […]

Over the last weeks many Napa vintners have been wondering whether they should be irrigating to prevent possible forthcoming effects caused by the drought statewide. Following the rain over the week-end, the cumulated amount of water received during winter is now around 10 inches, which is typically the case by […]