Growers with poor sugar beet crops in eastern England are taking legal advice over the issue.
They want to know why some crops failed to emerge properly, forcing them to redrill beet and face reduced yields.
East Anglian farmer Malcolm Stennett would usually expect to harvest 100 tonnes of sugar beet per hectare on his farm at Ingham, Bury St Edmunds.
But his yields this year will be much less after the crop emerged at half its expected plant population.
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VIDEO: Sugar beet fears