Surge in flea beetles as bee pesticide ban takes effect
25 September 2014 Last updated at 18:39 BST
Farmers are warning that oil seed rape crops are being destroyed because of a ban on a pesticide brought in to protect bees.
The chemicals were outlawed by the EU two years ago after research suggested they were damaging bees' brains.
But as Tom Heap reports, many farmers say this has left their emerging crop at the mercy of other insects.