displaces native vegetation, decreases habitat value and causes problems for agriculture.
As part of the grant, more than six hectares of Oxford Creek in the Narrabeen Lagoon Catchment will undergo removal of noxious and aquatic weeds including the Bidens, Cotton Bush, Crofton, Ludwigia
, Turkey Rhubarb, Morning Glory, Lantana, Privet, Bamboo, Wild tobacco, Tradescantia, Watsonia, Moth vine, Honeysuckle vine, Madeira vine, Cassia, Coral tree, Blackberry, Asparagus fern, Ginger lily, Pampas grass.
If you are buying plants for your pond, make sure to avoid the five following non-native invasive species that since April 6 this year are now banned: Azolla filiculoides (water fern); Myriophyllum aquaticum (Parrot's fern); Hydrocotyle ranunculoides (floating pennywort); Ludwigia
grandiflora (water primrose); Crassula helmsii (New Zealand pygmyweed).
Even the unique pollen of Trapa (Lythraceae) with its frilled crests bears a general resemblance to pollen of some species of Ludwigia
(Onagraceae) (Patel et al.
1993); continued presence of this species not confirmed Isodelphax basivitta Van Ludwigia
Most often used species were Ludwigia
sericea (Onagraceae) with 50% of the total nests (n = 32), followed by Eupatorium polystachyum (Asteraceae) with 10.
X Gaura coccinea Pursh 14 Ludwigia
polycarpa Short & R.
There is little vegetation near the spring head due to the substrate and heavy riparian cover, while the middle reaches have patchy areas of Ludwigia
repens and Pomatogeton illinoisensis (cf.
Verbenaceae 66 Ludwigia
Onagraceae At-tika hyssopifolia (G Don) Exell 67 Ludwigia
Onagraceae Kalo-keshari, prostrata Roxb.
elegan, Myriophyllum aquaticum and Alternanthera philoxeroides.
The dominant aquatic macrophytes coinhabiting mosquito microhabitat on the Dumbi included Cyperus denudatus, Heteranthera callifolia, Ludwigia
decurrens, Murdannia simplex and Scirpus uninodis.
Mr Gardiner said long-term control is often the only practical approach, but it was essential to strike early - as was demonstrated by recent work that has successfully stemmed the spread of Ludwigia
, an invasive non-native weed that blocks waterways.