The piercing problem of Chilean needle grass
Council is continuing to tackle Chilean needle grass, a high-threat and invasive weed with serious implications for the local environment and economy.
Councillors received an update at March’s Environment and Planning Committee meeting.
The persistent pest, first spotted in the Blind River area in the 1940s, has expanded its presence, with a total of 2,626 hectares affected as of the 2024/2025 season - an increase of 14 hectares from the previous year.
“Council staff, land occupiers and contractors have rallied together during the crucial seeding period from late October to mid-January, putting in significant efforts to manage and contain this pest,” Council Biosecurity Manager Liam Falconer said.
“Despite these efforts, nine new affected properties were identified this season, highlighting ongoing challenges in controlling its spread.”
Chilean needle grass has long stood as a national threat, with a recent study suggesting it could cost New Zealand up to $1.1 billion over the next 200 years if not adequately addressed.
“Since 2014, Council has increased its resources and implemented intensive search and destroy operations. These efforts aim to tackle new infestations early and support managing lightly and moderately affected properties. However, with 232 active infestations currently recorded, the battle is far from over,” Mr Falconer said.
In July last year, the Environmental Protection Authority approved Council's use of a rust fungus that affects Chilean needle grass, which was released in Blind River in October, and further releases are planned for the coming months.
Engaging the community is crucial in this fight. Council is exploring new ways to raise awareness about the risks associated with this pest, particularly within larger companies where turnover can lead to a lack of understanding regarding its spread.
A full review of the programme is set for 2027, aligning with the Regional Pest Management Plan.
