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Description: A floating fern with small, coarsely hairy oval leaves which repel water. As the plant
matures it turns from bright green to brown and bunches up into tight rafts. Reproduces by rapidly
dividing into smaller plants.
Distribution: A major weed of all river systems and connected wetlands in the lower Herbert. The
heaviest infestations are in the Cattle, Palm and Trebonne Creek systems.
Impacts: An aquatic weed that can choke waterways. It floats on still or slow-moving water and can
grow rapidly to cover the entire water surface with a thick mat of vegetation. This shades out any
submerged plant life and impedes oxygen exchange, making the water unsuitable for fish.
Key projects: Long term management projects are taking place in the Upper Cattle Creek, Palm Creek
and TYTO Wetlands reserve. These and other locations are also controlled by strategic releases of the
salvinia weevil which is an effective biological control agent.
Prevention Ongoing protection of the clean catchments identified within this Plan will
assist in the reduction of the spread of Salvinia. Ensure that Salvinia is not
introduced to ornamental ponds or water features.
Intensive
control
There are ongoing projects in Upper Cattle Creek, Palm Creek and TYTO
Wetlands reserve. There are limited resources available to expand current
scope of control programs at present.
Asset
protection
Targeted maintenance of key fish passage areas and high value wetlands in
the Palm and Cattle Creek systems will be ongoing as funding allows.
The Salvinia weevil biocontrol agent is an effective management tool in dense
infestations. The weevils are seasonal, often slowing down in the winter
months then re-emerging when warmer weather arrives. The weevil may
reduce the density and cover of an infestation but will not remove it
completely. In doing so they assist keep infestations at a manageable
threshold.
flower y y y y y y y y y y y y
vegetative x x x x x x t p t x x x
spray x x x x x x t p t x x x
manual x t p p t x x
biocontrol x x x x x x t p t x x x
J F M A M J J A S O N D
Salvinia molesta (Salvinia) P
rio
rity
D
eta
ils
Biology x
Peak t
First/last flush p
Occasional y
n/a
Control x
Optimal t
Good p
Marginal y
Not recommended
C
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ale
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ar
Ma
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me
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req
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em
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ts 1 2 3 4 5
Restricted matter category
6
2.5/5 1.5/5 4.0/5 4.2/5 4.8/5 2.2/5 2.0/5 1.4/5 1.2/5
47
Hin
ch
inb
roo
k L
oca
l G
ove
rnm
en
t A
rea
Bio
se
cu
rity
P
lan
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qu
atic
flo
atin
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l Salvinia molesta (Salvinia)
Salvinia weevil
Control
Spread
What is my biosecurity obligation?
Prevention zone
Ensure any machinery or vehicles moving from the infested areas
are free from plant material and soil.
Intensive control
zone
Manage infestations systematically from top of catchment down.
Ensure best practice weed hygiene measures are in place to reduce
risk of spread to new locations. Maintain weed free areas.
Asset protection
zone
Ensure best practice weed hygiene measures are in place to reduce
risk of spread to new locations. Maintain weed free areas. Identify
high value assets and protect them from impacts where possible.
For more information on management aims in each zone refer to Using the Biosecurity Plan templates
Restricted matter category
48
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