Hygrophila polysperma Scorecard

Species:  Hygrophila polysperma

Common Name:  Miramar weed

Scorecard created on
Last Updated on

Results

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

Ability to Respond Total:7 / 25Ability to Respond = ( Ease of Response + Tools in Place )

Confidence:Medium

Confidence Notes:

Impact

SpreadNotesScore
Spread RateH. polysperma stems are brittle, and easily fragment. These fragments easily develop new stands from rooted nodes of even small fragments.5
Spread AmountOnce established it is expected to spread rapidly, but only in aquatic systems.3
DamageNotesScore
EcologicalFast-growing and fast-spreading invasive that can out shade other submersed plants.5
Agricultural0
Infrastructure4
CulturalThis species also interferes with navigation of the waters it invades.3
Health0
BenefitNotesScore
Ecological0
AgriculturalH. polysperma appeared in the aquarium trade in 1945 known as 'oriental ludwigia'.1
Infrastructure0
Cultural0
Health0
Total19

Ability to Respond

Ease of ResponseNotesScore
DetectionAs a submerged aquatic species, it is very difficult to detect early infestations.1
ControlRegistered aquatic herbicides provide only marginal control of H. polysperma. Other non-chemical approaches are less effective.1
Tools in PlaceNotesScore
EntryAs a Federal Noxious Weed, it is not permitted to be sold or grown in the US. Also on CDFA Noxious Weed list.5
Control0
Outreach0
Total7

References

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