All used vehicles coming here from Japan will now undergo inspection and cleaning to eliminate biosecurity risks.

MPI says a car-carrying ship from Japan, which was found to contain stink bugs, will be allowed to port in Auckland this week after undergoing treatment.

David Vinsen from the Imported Motor Vehicle Industry Association says nearly 95 per cent of used vehicles already go through approved cleaning facilities.

"It's not going to make a big difference, it's just going to mean that we know that we've got 100 per cent has been treated and inspected before they leave Japan."

The blame for the infection is being placed on the previous Government, with the Biosecurity Minister's saying under-funding of MPI has led to two recent pest incursions.

Damien O'Connor was quizzed at Parliament this afternoon on his work staving off the mycobacterium bovis disease on farms as well as dealing with the stink bug.

He told the House he's pleased that every time he's gone to Cabinet to request biosecurity funding, his colleagues have acted in favour of fighting off these potentially-devastating pests or diseases.

"I have confidence in my colleagues to fund this system properly, because that previous Government didn't."

His comments came several hours before another farm in Southland was revealed to have tested positive for the cattle disease, making it eight infected properties in the province.

The Ministry for Primary Industries says the farm was connected with other infested farms in the area through movement of calves.

It was placed under movement restrictions several weeks ago.

It has now been confirmed on 24 properties, from Hawke's Bay to Canterbury, Otago and Southland, and all have been quarantined.