Growers are reminded to report any grass weeds that appear unfamiliar or could resemble black-grass (Alopecurus myosuroides). Early reporting remains one of our strongest tools for protecting the industry.
In May 2025, black-grass was confirmed in a post-harvest seed test. Since then, the affected paddock has been held until conditions are suitable to begin an ongoing management plan. This plan will use crop rotations that allow the best herbicide options and provide strong opportunities to identify any further plants through planned surveillance. These methods have proven effective in all previous responses.
All properties and sites of interest are now included in a comprehensive surveillance programme. The bales from the affected property remain isolated and will be destroyed when conditions allow, ensuring this risk does not spread further. Industry and Biosecurity New Zealand have been working throughout winter to finalise operational plans.
Now, as spring growth begins, vigilance is vital. Please remain alert for suspicious grass weeds. The importation of seed and grain always carries some risk, and black-grass can appear anywhere. Finding it is not a cause for blame or shame. Prompt communication through the correct channels is essential to protect our industry.
If you suspect black-grass, do not disturb the plant. Take a photo and report it immediately to the Biosecurity New Zealand Pest and Disease Hotline (0800 80 99 66).
Further information about black-grass can be found here or on the Environment Canterbury website here, or contact Ivan.Lawrie@far.org.nz or Ashley.Mills@far.org.nz