Invasive weeds are a serious threat to biodiversity in Victoria both on land and in aquatic environments.
Weeds compete with native plants for space, nutrients and sunlight. They change the natural diversity and balance of ecological communities. Weeds also affect the function native species have in providing nutrients and habitat for other species.
Weeds that have been introduced into the Australian environment have no natural controls from insects, grazing animals or fungi that feed on them to limit their spread.
There are over 1000 species of weeds occurring on public land in Victoria.
More about weeds
- Weeds often reproduce in a way that allows them to spread over large distances. For example, willows have winged seeds that are carried on the wind tens of kilometers from their source
- Woody weeds, such as blackberry and gorse, shade out native plants and create impenetrable thickets
- Scrambling weeds such as Bridal Creeper, smother native plants and create dense root mats that prevent other plants from accessing adequate moisture and nutrients
- Some exotic grasses out-compete native grasses and can create high fuel loads that can cause greater bushfire intensity
- Some weeds, like the Hawkweed, can produce biochemicals that inhibit the growth of other plants around them
Marine weeds can release large amounts of spores allowing them to reproduce quickly.
Parks Victoria works with the Department of Environment and Primary Industries, other land managers, land owners and community groups to manage weeds in parks.
The four objectives for weed management are to:
- Prevent their spread by making sure equipment and vehicles are clean of seeds and spores
- Eradicate small infestations that are unlikely to have spread beyond a definable boundary
- Contain infestations where they can be prevented from expanding beyond a defined containment line
- Protect assets (e.g. native plants and animals, neighbouring agricultural land) from the impacts of invasive weeds by reducing population densities.
Weed infestations are controlled mainly through the use of chemical sprays. However, in fragile environments such as the alpine peatlands and marine environments, weeds may be pulled manually by hand.
Biological control is another way weeds are controlled. This is when one living species (such as a plant, fungi or insect) is introduced to control an unwanted species. Biological control may be used when weeds are too widespread for chemicals to be used.
12 Aug 2016
All things fishy are being celebrated in Warrnambool this weekend, with marine volunteers across the state gathering at Deakin University for the third Sharing the Love forum. Friends of Merri Marine Sanctuary and Parks Victoria are hosting the event, which celebrates and supports community involvement in Victoria’s marine national parks…
17 Sep 2016 9:00am - 18 Sep 2016 4:00pm
The 10 Annual Kooyoora Wildflower Show is on September 17 and 18 at the Inglewood Eucalyptus Museum. Gates open at 9am each day and close at 4pm. $5 entry for adults with children U18 free. The event includes static wildflower displays, twice daily guided bus tours to Kooyoora State Park,…
19 Sep 2016 9:00am-10:30am
Brilliant Birds - PrimeSCI! activity for Prep - Year 2 students. Work in the field and identify our unique native birds. Record their numbers and find out if they are common or rare. Most importantly, understand their needs to survive and how they can be protected.
19 Sep 2016 9:00am-10:30am
PrimeSCI! activity for years 3-6. Become a palaeontologist for the day! What can fossils show us about the diet of dinosaurs? Why did they have claws? Lesson includes a tour of the Victorian Polar Dinosaur display in the Coolart Homestead.
19 Sep 2016 11:00am-12:30pm
PrimeSCI! will show you how to build a nest box for the birds of Coolart Wetlands & Homestead Reserve. Parents welcome to come along. Learn all about bird habitats and the need for nest boxes. All ages welcome!