(NBBJ) - After a dozen years of winegrape excess statewide, the California wine business is headed into several years of tighter supply to slake growing global demand while competition and costs of production are rising, according to experts at the Business Journal’s 2012 Wine Industry Conference in Santa Rosa on Wednesday. Building on his historical overview of the current winegrape shortage published in the Business Journal ["Winegrape shortage could last six to eight years", April 9], Zepponi & Company principal and four-decade wine and grape broker Joe Ciatti told the audience of about 500 that the state needs new vineyard acreage to get the 10 percent to 20 percent increase in tonnage needed to meet demand.