Ability to Respond Total:7 / 25Ability to Respond = ( Ease of Response + Tools in Place )
Confidence:Medium
Confidence Notes:
Impact
Spread
Notes
Score
Spread Rate
L. major does not produce seeds in New Zealand, but the plant is likely to spread through vegetative fragmentation from boating, fishing, weed harvesters and float planes, and possibly some species of bird.
4
Spread Amount
It can inhabit freshwater lakes, dams and slow-moving streams. It has the potential to become a troublesome weed of lakes and slow-moving streams throughout temperate and sub- tropical regions of the state
3
Damage
Notes
Score
Ecological
Lagarosiphon major can form dense floating mats in deep-water reservoirs and other water bodies and can block light penetration into waterways.
4
Agricultural
0
Infrastructure
3
Cultural
Lagarosiphon major can also restrict the passage of boats and limit recreational activities like swimming and angling.
4
Health
0
Benefit
Notes
Score
Ecological
From New Zealand literature, L. major has some beneficial attributes.
2
Agricultural
0
Infrastructure
0
Cultural
0
Health
0
Total
16
Ability to Respond
Ease of Response
Notes
Score
Detection
Detection of a submerged aquatic plant is difficult, particularly new infestations.
1
Control
Control strategies are difficult for this submerged aquatic species.
1
Tools in Place
Notes
Score
Entry
This species is a Federally listed Noxious Weed but is not found in the US as of yet. It introduction is currently restricted.
