An invasive aquatic weed threatening NSW waterways and wetlands Ludwigia longifolia can form dense colonies in slow moving and static waterways. If no control action is taken it will dominate temperate and tropical wetland and riparian systems throughout Australia.
Impacts:
Ludwigia longifolia is also listed a class 5 noxious weed throughout nsw. As a notifiable weed, all outbreaks of ludwigia longifolia must be reported to the local council within three days. The plant must not be sold, propagated or knowingly distributed.
Description:
Ludwigia longifolia is an erect annual shrub up to 3 m high which has a shallow fibrous root systems
Control:
Control of L. longifolia is very difficult. Mechanical/hand removal may be the most desirable method for small isolated infestations. However care must be taken to dispose of the material appropriately; care should be taken to avoid fragmenting the plant and leaving behind pieces that could start new infestations. Correct disposal is essential to prevent further spread. All plants should be removed before seed set and destroyed by burning or deep burial to stop plant re growth from stem sections.
Source http://www.dpi.qld.gov.au