An Auditor-General's report says the Department of Conservation is losing the battle against the pests that threaten New Zealand's indigenous species.
The report says DOC is merely slowing the decline of biodiversity in this country and to do more it needs the assistance of local government, businesses and the community.
It reveals the department is currently able to actively manage only one eighth of the conservation estate and 200 of 2800 threatened species.
The department's acting director general, Doris Johnston, says where DOC is working with iwi, regional councils or businesses, endangered plants and animals are being preserved.
But Green Party MP Eugenie Sage says that after 100 redundancies at the department this year, and more likely, its ability to collaborate is diminishing.