Striga asiatica Scorecard

Species:  Striga asiatica

Common Name:  witchweed

Scorecard created on
Last Updated on

Results

Impact Total:16 / 35Impact = ( Spread + Damage - Benefit )

Ability to Respond Total:17 / 25Ability to Respond = ( Ease of Response + Tools in Place )

Confidence:High

Confidence Notes:

Impact

SpreadNotesScore
Spread RateSpreads quickly via seed.4
Spread AmountNot currently present in California.4
DamageNotesScore
EcologicalPotential to out compete native species and crops.4
Agriculturala serious agricultural pest as it parasitises important crop species including corn, rice, sorghum, and sugar cane, often causing substantial yield reductions.2
Infrastructure0
CulturalImpacts recreational use in some areas.2
Health0
BenefitNotesScore
EcologicalMajor competitor of native grasses.0
Agricultural0
Infrastructure0
Cultural0
Health0
Total16

Ability to Respond

Ease of ResponseNotesScore
DetectionSeedlings not visible above ground, but white succulent shoots can be found attached to host roots.2
ControlSeed banks, seed spread are a problem. If established in agricultural situation requires growing a non-host crop. Difficult to control once established.2
Tools in PlaceNotesScore
EntryNot present but regulatory barriers in place.5
ControlEarly eradication is essential, currently listed as noxious weed so control is mandated.5
OutreachSome3
Total17

References

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