Onopordum acanthium Scorecard

Species:  Onopordum acanthium

Common Name:  Scotch thistle

Scorecard created on
Last Updated on

Results

Impact Total:19 / 35Impact = ( Spread + Damage - Benefit )

Ability to Respond Total:13 / 25Ability to Respond = ( Ease of Response + Tools in Place )

Confidence:High

Confidence Notes:

Impact

SpreadNotesScore
Spread Raterapid reproduction, high seed set.4
Spread Amountnear complete spread already.4
DamageNotesScore
EcologicalPotential to out compete native species and crops.4
Agriculturalproblem for grazing.4
Infrastructure2
Culturalimpacts recreational use of grasslands.2
Health0
BenefitNotesScore
Ecologicalmajor competitor of natives.0
Agricultural0
Infrastructure0
Culturalsome use as an ornamental, but illegal to sell and eradication is mandated.0
Healthlimited medicinal use.1
Total19

Ability to Respond

Ease of ResponseNotesScore
Detectiondetection occurs after establishment.3
Controldifficult to control once seed bank established.2
Tools in PlaceNotesScore
EntryCalifornia noxious weed A, but still widely moved around with few mandates.3
Controlgood management, no over-grazing, some herbicides, limited biocontrol.3
OutreachOn both CDFA and Cal-IPC lists.2
Total13

References

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