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Feral native species listing makes it easier to manage Mimosa on-farm

The listing of Yellow Mimosa as a feral native species is making the control of this invasive pest much easier to manage for landholders in North Western NSW.

Mimosa control on the property 'Brolga' at Boomi is already taking full advantage of the listing of Yellow Mimosa (Vachellia farnesiana) as a feral native species. The control program will promote the growth of native trees and allow the unrestricted movement of water through the Brolga Nature Corridor in times of flood.

"The Brolga Nature Corridor is a well established strip of native trees, originally planted in 2003-04," explained Chris Perceval, Local Land Services Officer – Native Vegetation.

Chris says he is now working on a 'case study' on Brolga to identify best practice for the treatment of Mimosa in riparian areas without destroying desirable native species.

To reduce the use of expensive chemical treatments in a sensitive riparian zone, the Brolga trial has used a mulching attachment on a skid steer loader to remove Mimosa bushes choking the tree corridor.  

"The use of the mulching attachment in phase one of the study has kept groundcover disturbance to a minimum which is a requirement for treating Mimosa in steep and riparian land.  Our aim now is to re-assess the site one month after mulching and develop our phase two treatment strategy from there."

Contractor Ben Fragar supplied a Terex Forestry Mulcher (pictured below) for the job, which had the flexibility to remove Mimosa bushes growing between native trees.   "Using the mulcher improves the soil as well as getting rid of the weeds. You leave behind a finely shredded mulch instead of bare dirt, which reduces moisture loss. 

"The other benefit of the mulcher is that you don't leave behind piles of debris that need to be burnt or carted away, so it's a neater, more efficient operation."

Terex Forestry Mulcher 

Yellow Mimosa is a native of Central America cultivated in many tropical countries for its bark, gum, seed, wood and perfumed flowers. Mimosa is believed to have been introduced to Australia before European settlement. 

Scattered Mimosa bushes can provide shelter for grasses and groundcover species, as well as habitat for fauna such as small lizards and birds.  However, heavy infestations can become large and impenetrable, reducing stock carrying capacity and blocking access to watering points.

In 2010,the Border Rivers-Gwydir CMA made a submission to the NSW Department of Environment Climate Change and Water (DECCW) to have Mimosa listed as a feral native species, in an effort to reduce red tape for landholders wishing to clear the weed.

In September 2013 the NSW Environment Minister listed Yellow Mimosa as a feral native species under clause 17 of the Native Vegetation Regulation 2005.

The new listing allows for the removal of Yellow Mimosa as a routine agricultural management activity without the need for a Property Vegetation Plan. Landholders are now required to follow just two simple conditions for soil protection relating to clearing near rivers and creeks and on steep slopes.

Northern Tablelands Local Land Services can assist landholders with the management of native vegetation and the implementation of sustainable farm management practices. Contact your local LLS office for further advice on land management and the benefits of native vegetation.

Media contact:     Annabelle Monie Border Rivers-Gwydir CMA, Phone:  02 6728 8032, Annabelle.Monie@lls.nsw.gov.au

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