The proposed aerial 1080 drop in the Matukituki Valley will not go ahead. The Department of Conservation says it will focus on higher priority areas.
About 18,509ha of the Matukituki Valley in the Mt Aspiring National Park, covering parts of both the east and west valleys, was part of the operation.
Department of Conservation Wanaka spokeswoman Annette Grieve said the Battle for Our Birds operation would now focus on high-priority areas.
Rodent numbers were lower in the Matukituki Valley and the bird populations were considered to be at less risk than in other areas, she said.
Unsettled weather in the past month had meant an aerial operation in the Makarora Valley had yet to start with the pre-feed stage.