Read this autumn black grass update here.
Black-grass (Alopecurus myosuroides) is one of the world’s most challenging grass weeds in temperate cropping systems. It is well known in the UK and Europe for reducing yields, disrupting rotations, and developing herbicide resistance. In New Zealand, early detection and strict management have so far prevented establishment.
Over the summer, no new Black-grass plants have been detected. AssureQuality continues active surveillance on properties of interest from the 2021 and 2025 responses. All straw bales from the 2025 response have been safely destroyed using air-curtain incineration, removing any residual risk.
As autumn-sown crops are going in, growers are reminded that this is a critical period for monitoring. Black-grass can germinate in early autumn, especially in wetter soils, and early detection in young crops is key to preventing establishment. Inspect paddocks carefully, especially where crop residues remain or in high-risk fields.
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