The Environment Secretary Owen Paterson has said that the Government has done "the right thing at the right time" over ash dieback.
Asked by the BBC whether the ban on ash tree imports had been too late, he said the restrictions would have been pointless because no trees are planted during the summer months.
He said the issue was being dealt with at "the highest level" of Government.
Experts say little can be done to stop the spread of 'Ash dieback' the disease threatening to devastate the UK's ash trees.
One of the UK's biggest tree growers will seek damages from the government after losing thousands of trees to ash dieback disease.
The disease threatening to wipe out the majority of Britain's ash trees may have spread - as experts say an import ban was too slow.