Scotch thistle Onopordum acanthium L




Дата канвертавання25.04.2016
Памер8.21 Kb.

Scotch thistle

Onopordum acanthium L. Sunflower Family

Key identifying traits




Biology and ecology


  • Tap-rooted biennial that reproduces by seed

  • Invades roadsides, range and disturbed areas

  • Thrives in sunny sites – but can tolerate shade

  • Up to 50,000 seeds per plant; seeds viable 6-15 years

  • Repeated branching may result in plants 5’ wide

  • Dense stands can create barriers that restrict livestock

  • Drought tolerant but can flourish along open streams

Control


Prevention- Learn to identify the plant; know your property; beware of fill dirt, hay, manure and seed from outside your area

Biological – No known biological controls

Cultural – Competitive vegetation helps reduce open spaces for invasion

Mechanical – Mowing can stop seed production in short term, but plants can regrow; digging cutting and cultivation are effective; monitor for new growth season long; seed bank will remain for years

Chemical – Several effective at label rates; best timing is in early spring when plants are in rosette stage and again in fall when more rosettes germinate







a yard stick on a Scotch thistle rosette
Where found- Scattered small infestations, particularly in old barnyards as well as some sites covering several acres over pasture/range ground in the northern half of the county.




Created by Stevens County Noxious Weed Control Board, March 2000; Updated Jan 2006


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