Special disposal notes: No seed produced, spread by rhizomes and extremely persistent tubers (and stems to a lesser extent). Maintain strict weed hygiene. Intensive follow up required to deal with sprouting tubers.
How to Control:
- Pull out roots & rake up aerial tubers. Place all parts in black plastic bags/sheets and leave to cook in sun, or bag and take to landfill.
- Cut stump application: Cut stems and treat with (100ml glyphosate /1L water), or (1g metsulfuron/1L water ) or (100ml Tordon Brushkiller®/1L water) or (100ml triclopyr/1L water). Dispose of cut parts to landfill or place in black plastic bags/sheets and leave to cook in sun.
- Drill and fill: For larger stems drill (c.10mm drill bit) sloping holes into the stems, & immediately fill each hole with (5g metsulfuron/1L water)
4. Larger infestations can be controlled by carefully cutting back any growth covering desirable vegetation & spray remaining growth spring-autumn (3g metsulfuron + 100ml glyphosate + 20ml penetrant/10L water), or (5g metsulfuron + 10 mls penetrant/10 L), or (60mls triclopyr/10L water – best for ground level tubers).
Incrediblly persistent tubers. Practice very strict weed hygiene. Contact Weed Action Co-ordinator for help controlling this weed.