In one case from this harvest season in the Central Valley, thieves cut through a fence and hauled off $400,000 in walnuts.
Investigators suspect low-level organized crime, while some pilfered nuts are ending up in Los Angeles for resale at farmers markets or disappear into the black market.
Such heists have become so common that an industry task force has devised ways to thwart thieves. Domestic demand for specialty foods and the expanding Asian market for them have prompted a nut orchard boom in the state's agricultural heartland, which is a worldwide leader.
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