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PERI-URBAN ENVIRONMENTS AND
WEED INVASION: ISSUES,
CONSEQUENCES AND SOLUTIONS.

This is a placeholder image. To replace ei...
Weed Impacts
• Weeds cost Australia $3.5-4.5 Billion annually
• Environmental costs – similar magnitude
• A new weed intro...
Peri-urban weed Issues
•
•
•
•
•
•
•
•

Land speculation
Land value
Lack of weed awareness
Weed management restrictions
Fi...
The Weed Invasion Curve
PREVENTION
Solution - Weed Risk Assessment
• Majority of weeds – garden plants
• System for declaration of weeds
• Many weed species ...
ERADICATION
Alligator weed – Weed of National
Significance
• Found in peri-urban
gardens being grown as
garden vegetable by Sri
Lancan...
Solutions
• Brushoff appeared to kill
plants but resulted in
fragmentation - alive
• Mixture of glyphosate and
brushoff wa...
CONTAINMENT
Containment – Serrated Tussock

• 4 ha in peri-urban suburb
of Broadmeadows in 1954
Containment – Serrated Tussock

• 4 ha in peri-urban suburb
of Broadmeadows in 1954
• 30,000 ha by 1980
Containment – Serrated Tussock

• 4 ha in peri-urban suburb
of Broadmeadows in 1954
• 30,000 ha by 1980
• 130,000 ha by 19...
Victorian Serrated Tussock Working
Party
• Community lead strategy
• Developed in collaboration with DEPI and
facilitated ...
Solutions – Victorian Serrated Tussock
Working Party
• Comprehensive
enforcement program
• Grazing and pastures
• Herbicid...
Containment – Serrated Tussock
Working Party

• 45,000 ha now under
long term control
ASSET BASED PROTECTION
Western Grassland Reserve
• Less than 0.5% of
“pristine” basalt
plains grasslands
remain.
• Offset for peri-urban
growth e...
Western Grassland Reserve
• Adaptive weed management
• Herbicide impacts on native
species
• Weed eradication trials
Biological Control
• Uses natural enemies of the weed such as
insects, mites or fungi from the weeds
country of origin.
• ...
Biological control of Gorse
• Gorse is a serious weed in the periurban localities of Wallan and
Kilmore north of Melbourne...
Conclusions
Issues
• Time poor
• Many absentee landowners
• Land fragmentation
Solutions
• Weed Research
• Contractors
• S...
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McLaren_D_Peri-Urban environments and weed invasion: issues, consequences and solutions

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Beyond the Edge: Australia's First National Peri-Urban Conference
La Trobe University
Oct 2013

Published in: Technology, Business
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Transcript of "McLaren_D_Peri-Urban environments and weed invasion: issues, consequences and solutions"

  1. 1. PERI-URBAN ENVIRONMENTS AND WEED INVASION: ISSUES, CONSEQUENCES AND SOLUTIONS. This is a placeholder image. To replace either right click and select “change picture” or insert a new picture via the insert menu and crop to Jackie David McLaren1,2, Greg Lefoe1, Tony Dugdale1, size. Steel1, Raelene Kwong1, Charles Grech1, John Weiss1, Fiona Ede1, Franz Images are1,available from: 1 and Trevor Hunt1. Mahr Daniel Clements http://dse.lookat.me.com.au/ or 1Department of Environment and http://imagelibrary.dpi.vic.gov.au/ Primary Industries 2La Trobe University
  2. 2. Weed Impacts • Weeds cost Australia $3.5-4.5 Billion annually • Environmental costs – similar magnitude • A new weed introduction can threaten produce exports and cost $millions in control and eradication costs • Peri-urban communities are the interface between urban and rural landscapes
  3. 3. Peri-urban weed Issues • • • • • • • • Land speculation Land value Lack of weed awareness Weed management restrictions Fire Weed sources – purchasing weeds Machinery and soil movement Animals and fodder movement
  4. 4. The Weed Invasion Curve
  5. 5. PREVENTION
  6. 6. Solution - Weed Risk Assessment • Majority of weeds – garden plants • System for declaration of weeds • Many weed species now voluntarily withdrawn from sale by the nursery industry or have been declared noxious. Arum lily Privets Pampas grass
  7. 7. ERADICATION
  8. 8. Alligator weed – Weed of National Significance • Found in peri-urban gardens being grown as garden vegetable by Sri Lancan community. • Publicity campaign • Over 800 infestations treated • Land ownership/transfer
  9. 9. Solutions • Brushoff appeared to kill plants but resulted in fragmentation - alive • Mixture of glyphosate and brushoff was effective. • Now have successful tools for eradication. • Using UAV have been able to successfully map Alligator weed infestations.
  10. 10. CONTAINMENT
  11. 11. Containment – Serrated Tussock • 4 ha in peri-urban suburb of Broadmeadows in 1954
  12. 12. Containment – Serrated Tussock • 4 ha in peri-urban suburb of Broadmeadows in 1954 • 30,000 ha by 1980
  13. 13. Containment – Serrated Tussock • 4 ha in peri-urban suburb of Broadmeadows in 1954 • 30,000 ha by 1980 • 130,000 ha by 1996
  14. 14. Victorian Serrated Tussock Working Party • Community lead strategy • Developed in collaboration with DEPI and facilitated large community serrated tussock control grants and extension • Worked in collaboration with Shires and Councils who implemented rate rebate schemes for weed management including serrated tussock.
  15. 15. Solutions – Victorian Serrated Tussock Working Party • Comprehensive enforcement program • Grazing and pastures • Herbicides • Biological control • Modelling Workshops Web sites Management • Fire risk guides • Extension Papers Media
  16. 16. Containment – Serrated Tussock Working Party • 45,000 ha now under long term control
  17. 17. ASSET BASED PROTECTION
  18. 18. Western Grassland Reserve • Less than 0.5% of “pristine” basalt plains grasslands remain. • Offset for peri-urban growth expansion around Melbourne
  19. 19. Western Grassland Reserve • Adaptive weed management • Herbicide impacts on native species • Weed eradication trials
  20. 20. Biological Control • Uses natural enemies of the weed such as insects, mites or fungi from the weeds country of origin. • Sustainable as biological control agents breed and maintain populations and attack the weed year after year. • Every $1 spent on biological control has returned $23 to the Australian community
  21. 21. Biological control of Gorse • Gorse is a serious weed in the periurban localities of Wallan and Kilmore north of Melbourne. • Community and Government cooperation • Equine landcare group – link for Wallan/Kilmore.
  22. 22. Conclusions Issues • Time poor • Many absentee landowners • Land fragmentation Solutions • Weed Research • Contractors • Share farming • Community engagement and empowerment • Biological control
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