Environment Tasmania, The Wilderness Society and Australian Conservation Foundation will release a report today that claims a higher proportion of areas earmarked for reserve will be logged under the deal's conservation agreement than would have been if it had never been signed.

The report claims that Forestry Tasmania was logging 13,100 cubic metres (or 52 per cent of its total cut statewide) within 430,000 hectares earmarked for protection in November and December.

Another 12,300 cubic metres was earmarked for January and February within that same contentious zone.

Environment Tasmania director Phill Pullinger accused the government business enterprise of increasing its rate of logging in forests valued by conservation groups in a deliberate attempt to create conflict.

``We believe this is a deliberate ploy to play environmentalists and timber workers off against each other and drive down the native forest conservation outcomes,'' Dr Pullinger said.

He said it was well overdue for the state and federal governments to do more to pull the agency into line.

FT spokesman Ken Jeffreys described the claims as ludicrous.

``When Gunns withdrew the harvest of native forest (in Tasmania) had already reduced from 300,000 hectares to around 150,000,'' he said.

``The environment groups continue to ignore the fact that this agreement was as much about guaranteeing (wood) resources as it was about (creating) reserves.

``Our data has been independently verified not once, but twice and the facts speak for themselves - and no amount of desktop analysis done to put pressure on this situation is going to change that.''

Mr Jeffreys said he would be happy to respond in detail after he had seen the report.

According to the same report before the intergovernmental agreement was signed in August, Forestry Tasmania had planned to log 109,800 cubic metres within that zone in 2011-12.