(Wines&Vines) - The availability of labor is a problem that’s going to continue, according to Keith Striegler, who moderated a session about winemaker experiences with vineyard mechanization during the recent Unified Wine & Grape Symposium in Sacramento. Striegler, grower outreach specialist for E. & J. Gallo Winery, noted in his introduction that more vineyard operations and practices are being mechanized, and mechanized pruning, shoot thinning and leaf removal change vineyard appearance.