Insight: Seeds of trouble sown at Diamond Foods years ago

(Reuters) - The accounting scandal at snack maker Diamond Foods in recent months may have shocked shareholders and some California walnut farmers. But a number of accounting and industry experts spotted red flags some time before. A close examination of business practices at Diamond Foods, the nation's largest walnut processor and maker of Emerald nuts, points up a number of warning signs, including unusual timing of payments to growers, a leap in profit margins, and volatile inventories and cas

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