Queensland Premier Anna Bligh has promised to create a green corridor to protect biodiversity from the 'border to the beach' if her government wins re-election.

Ms Bligh is continuing her pitch to voters ahead of the state election and has travelled to the Thompson River, outside Longreach in western Queensland.

She says Labor will create a 2,200-kilometre corridor from the south-west border through Longreach, the Darling Downs and into the south-east as part of its 'border to the beach' policy.

The plan involves the creation of new national parks and voluntary conservation agreements with landholders to ensure good management of the corridor.

Ms Bligh says it will cost $15 million over three years to start entering into the voluntary agreements, and the corridor will take 10 years to finish.

"In some places, we'll be looking to secure protection from large-scale mining, large-scale irrigation that would interfere with the flow of the rivers," she said.

There will be different levels of protection so the agreements will not necessarily lock up the land.

The Wilderness Society's Dr Tim Seelig has applauded the pledge.

"If we are to save the wonderful wildlife and sustain the landscapes of Queensland we have to think big," he said.

"Nature needs to be connected across large areas for species to survive."

Meanwhile Liberal National Party leader Campbell Newman has announced an extra $6 million over four years to employ 15 more biosecurity officers.

He says the additional staff will help protect the state against the threat of animal and plant diseases.

He has also promised $2 million for land audits to identify areas suitable for increased productivity.

The announcements come after Ms Bligh again criticised Mr Newman over more allegations about developer donations to his campaign fund when he was Brisbane mayor.

The ABC has contacted Mr Newman for comment on this morning's claims.

Mr Newman yesterday denied any wrongdoing, saying he had no influence over the council approval process.

He is yet to comment on the latest revelations.