covering a farm pond restricts commercial and recreational use and degrades aesthetics

covering a water-body and supporting the growth of other plant species in Kakadu National Park, Australia

the hairs form an 'egg-beater' shape at the tips

hairs are separated by the tips

primary form

secondary form

tertiary form

Lake Moondarra, Australia covered before the use of biological control

Over 90% of salvinia on Lake Moondarra was destroyed within 14 months by the salvinia weevil

Werombi creek in temperate Australia, near Sydney, before the use of biological control

Werombi creek in temperate Australia, near Sydney, three years after the weevil was released