Harvest has begun in Napa Valley. After a heat wave that threatened to turn the grapes into raisins, the weather cooled and the buzz is that the vintage will be stellar. But vintners have other worries -- namely, immigration issues that are affecting vineyard workers. A few vintners are experimenting with mechanical harvesters as a fallback in case there's a shortage of workers in coming years.
Dave Getzschman / For The Times
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