Special disposal notes: Most or all of its spread is by rhizomes (and stems that can also re-sprout), through dumping of greenwaste, as little or no seed is set in New Zealand.
How to Control:
- Cut down close to ground, dig out entire root/rhizome mass (large clumps will require machinery). Dispose of roots/rhizomes to landfill, or by deep-burying on site, or knock off the soil and pile up (ideally on a bed of dry wood) and burn when appropriate. Slashed stems occasionally re-sprout but can usually be left to rot down on site.
- Cut stray emergent shoots at ground level, inject 10 ml undiluted Amitrole into each stem. Extra care must be taken when using undiluted herbicde: Minimise herbicide contact with soil and other vegetation as Amitrole is non-selective, residual and corrosive.
- Cut down close to ground & knapsack spray regrowth when 60cm with (150ml haloxyfop + 50ml crop oil/10L water). Repeat treatment required.
- Cut down close to ground & knapsack spray regrowth at or at approximately 1.5m with (200ml glyphosate + 5g metsulfuron + 100ml penetrant/10L water). Total coverage and follow-up is essential for effective control. Continue respraying re-growth at 1.5m until regrowth ceases (may require 4-6 treatments).
Can be controlled by grazing. Follow up frequently until eradicated. Don’t replant until 6 months after last herbicide application.
Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.