Friends of the Earth said Government figures show the average UK oilseed rape yield rose nearly seven per cent last year, in the first harvest after the ban was introduced.The pressure group said recent scientific evidence has added to the concerns about the impact of the three neonicotinoid pesticides on bees and other pollinators.
The NFU and AHDB said the chemicals are vital to combat Cabbage Stem Flea Beetle and losses have occurred since the EU forced neonicotinoids off the market.
Syngenta and Bayer products were to have been used on 195,000ha of sown crops, a third of the oil seed rape grown.
The NFU has said it will persist in applying for the emergency use of neonicotinoid seed treatments on behalf of farmers facing pressure from cabbage stem flea beetle.
NFU vice president Guy Smith said: "This is a blow for arable farmers across the country whose oilseed rape crops are under heavy threat from cabbage stem flea beetle. We are disappointed with the Minister’s decision; we strongly argued the case on behalf of our members.
"We remain committed to obtaining approval for the emergency use of neonicotinoid seed treatments for this planting season. These plant protection products are absolutely vital in protecting England’s oilseed rape crop from pests.
"We are currently looking into making further applications."