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Southern Fleurieu

Sustainable-production:  Controlling agricultural weeds

Low Priority

What is this issue

Spread of existing agricultural weeds (Increasing low input weed species).

Impacts of the issue

Weeds reduce the production from grazed pastures and increase soil susceptibility to erosion.


  • Insufficient control of weeds
  • Low landholder priority
  • Lack of landholder knowledge, management capacity
  • Increase in lifestyle properties, high landholder turnover


  • Gaining voluntary compliance with the Natural Resources Management Act 2004
  • Engaging landholders to control weeds on their properties 
  • Capacity of individuals to identify weeds
  • Insufficient resources, time and personnel to tackle on a largescale
  • Different perceived impacts of weeds, i.e. organic farming, broad acre, lifestyle
  • Regular new weed incursions   
  • Lack of follow up treatment in successive years
  • Difficult terrain
  • Reinfestation likely when neighbours are not coordinating their efforts
  • Continued spread and reinfestation by stock
  • Human movement and transport
  • Industry hygiene and movement from businesses outside of farming, i.e. earthmoving, construction, transport

Climate impacts and adaptation needs

  • Identify areas that will be more susceptible to weed invasion under future climate change models
  • Identify ALERT weeds to prevent incursion of under climate change scenarios
  • Potential changes to weed behaviour, i.e. flowering time, spread, survival

Who plays a role

  • Department of Environment, Water and Natural Resources (particularly Parks SA staff)
  • Landholders
  • Local Action Planning and Landcare groups
  • Local Government (District Council of Yankalilla, City of Victor Harbor, Alexandrina Council)
  • Primary Industries and Regions SA
  • SA Murray-Darling Basin Natural Resources Management Board 

Strategies and Actions

Contain spread of weed populations

  • Regular monitoring of areas with known weed populations
  • Promote and support landholders to undertake early and regular containment works, to minimise further spread
  • Support landholders to coordinate with neighbouring properties for weed management
  • Support quarantine measures, i.e. Control movement and sale from infested properties, holding pens and plant hygiene
  • Promote good biosecurity hygiene practices to prevent further infestations

Protect sites of high value within the region

  • Map key assets/ sites of the region and their weed threats
  • Support control of infestations in close proximity to key assets/ sites, aiming for a significant reduction in density
  • Monitor change in distribution within and in close proximity of key assets/ sites
  • Prevent incursion of weeds by encouraging natural regeneration and/or planting native species
  • Prevent incursion of weeds by managing total grazing pressure

Manage weeds using a landscape approach

  • Research, trial and develop integrated weed management packages - using both biological and herbicide treatments where possible
  • Promote integrated weed management technique to land managers
  • Support the collaboration of neighbours on control campaigns as a landscape approach
  • Recognise and reward land manager efforts at best practise weed control