A backlog in grass and weed maintenance in Dunedin is expected to be cleared by Christmas.

Fulton Hogan picked up a 10-year roading maintenance contract from the Dunedin City Council this year, but has had some difficulty controlling vegetation.

DCC transport group manager Jeanine Benson said the council was working with Fulton Hogan and its vegetation control subcontractor, Whitestone, to clear the backlog.

Extra crews had been brought in and she expected they would catch up on the work by Christmas.

Fulton Hogan took over the contract from Downer in May, when only essential work was allowed during the Covid-19 lockdown.

That caused some delays, adding to the complexity of the transition, Ms Benson said.

"The parties have experienced teething troubles during the transition ...," she said.

At the time the $260million contract was awarded, the council emphasised that quality of service was important.

Ms Benson said the contract allowed penalties to be imposed if there were problems for an extended period, but the council’s focus was on supporting the companies to catch up on the work.

"We are confident the extra efforts of all concerned mean the problems are well on the way to being resolved."