A Walnut Grower Stands in His Walnut Grove in Rio Oso, California

Walnut grower Matt Conant and his dog Lexi walk through his walnut grove in Rio Oso, California February 23, 2012. "There's a lot of uncertainty right now," says Conant, former supplier to Diamond Foods and district director of the California Farm Bureau Federation. An accounting scandal over the payments made by the largest U.S. walnut processor Diamond Foods Inc to its growers has hurt their confidence in the company.