Clarence strategic weed management – a prickly problem
20 December 2017
Over the last two years North Coast Local Land Services have partnered with Clarence Landcare and private and public landowners to strategically manage one of Australia’s worst weeds.
The extent of a particular weed species invasion globally, across Australia, in New South Wales or even in a single river catchment can vary from being widespread to quite localised.
Sometimes the extent of a weed invasion, coupled with potential or actual impacts that a weed may have on primary production or other environmental assets, can make it challenging to effectively manage with limited resources.
Tony Broderick, Team Leader North Coast Local Land Services said, “Some weeds may be widespread in other catchments or other parts of the Clarence but some, such as the very prickly Mysore Thorn (Caesalpinia decapetala), are quite limited in their distribution and abundance.
“Clarence Landcare’s expert field botanist, Fig Forest, has been mapping Mysore Thorn distribution so that subcontractors and landholders can limit it’s expansion.”
Tony continues, “Mysore Thorn can form dense swathes and climb into the forest canopy and its pea-like pods and seeds are effectively dispersed along rivers in floods and can invade channels and floodplain fringes.
“It was surprising to find a thicket of this weed well out of the flood zone in Dalmorton State Forest in a gully at an old mine site and, so far, it is the known source of all downstream invasions along the Boyd River.
To assist in the management of this prickly invader, Forestry Corporation of NSW Protection Coordinators Tim Ruska and Jason Bee recently inspected the invasion site with Fig Forest to scope out Forestry Corporation on-ground tactics to control this localised weed seed source.
Tim Ruska said “Weed management is a significant issue across all tenures but collaborations such as the one with North Coast Local Land Services and Clarence Landcare and other stakeholders is the only way to strategically manage such an aggressive invader such as Mysore Thorn.”
Mark Robinson, Land Services Officer, Phone 6659 9405
1: Fig Forest (Clarence Landcare), Tim Ruska and Jason Bee (Forestry Corporation of NSW) near the Mysore Thorn infestation in Dalmorton State Forest
2: Prickles on a mature stem of Mysore Thorn. Tangles of this weed not only degrade production and environmental natural assets but are also a hazard