Does late-season irrigation degrade quality in winegrapes? Does a cold soak before fermentation increase quality in wine? Speakers debated these contentious issues and others this week during a heavy schedule of seminars running through the annual meeting of the Washington Association of Wine Grape Growers. The session about cold soaks featured a researcher whose recent studies appear to contradict much of the conventional wisdom about the technique, while two of three winemakers who spoke said they believe cold soaking is good for their wine, even if they can’t explain why.