The opposition-day debate on the spread of Chalara fraxinea on 12 November heard shadow environment minister Mary Creagh say ash dieback would "change our landscape forever".
"It is an environmental, ecological and economic disaster," she said.
Creagh told MPs: "Ministers could have started the consultation on a ban back in April instead of leaving it until the end of August. The question on everyone's lips is: 'Why didn't they?'"
Environment minister David Heath dismissed Labour's criticism.
He said: "Perhaps it would be helpful to the House if I said that as of today the results of that survey show 155 cases of ash dieback caused by Chalara across Great Britain, 15 of these are in nursery stock, 55 are in recently planted sites and 85 are in the wider environment.
"Further suspect cases are currently under investigation and we'll continue to provide updates on confirmed cases through the Forestry Commission website."