The task force's major report on urban renaissance last week said there was 'excessive release of greenfield land' in north-east cities such as Newcastle which was 'exacerbating the decline of inner urban areas'.
The task force warned that the government was likely to miss its national target of 60% of new homes being built on previously used brownfield sites.
Deputy prime minister John Prescott immediately signalled a possible retreat from the target by saying it was vital not to become 'obsessed' by the figure.
Development chairman Kevin Jones dismissed the attack as 'absolute rubbish'.
A special agreement meant that for every home built on greenfield land north of the city, two would be built on existing brownfield sites, Mr Jones said.