Centaurea solstitialis Scorecard

Yellow Starthistle, photo by Jack Kelly Clark, UC Statewide IPM Program

Species:  Centaurea solstitialis

Common Name:  yellow starthistle

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. Rated high in the Cal-IPC inventory.4
AgriculturalProblem for grazing.3
Infrastructure2
CulturalImpacts recreational use of grasslands.2
HealthHurts!1
BenefitNotesScore
EcologicalMajor competitor of natives.0
AgriculturalGood for honey but displaces native species also good for honey.1
InfrastructureNo apparent potential benefit.0
CulturalHoney0
Health0
Total19

Ability to Respond

Ease of ResponseNotesScore
DetectionDetection occurs after establishment.3
ControlDifficult to control once seed bank established.3
Tools in PlaceNotesScore
EntryCDFA C listed.1
ControlActive CDFA biocontrol program and Weed Management Areas can have active programs.2
OutreachOutreach info widely distributed and extension activities thorughout state.4
Total13

References

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