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Herbicide impacts on exotic grasses and a population of the critically endangered herb Calystegia affinis (Convolvulaceae) on Lord Howe Island

Journal Article


Abstract


  • Introduced perennial grasses are capable of altering the habitat of native species, causing reductions in

    population size and vigour, and potentially affecting life-history processes such as survival, pollination and seedling

    recruitment. We examined the utility of herbicide treatment on two exotic grasses, Pennisetum clandestinum (Kikuyu)

    and Stenotaphrum secundatum (Buffalo grass) to restore the habitat of Calystegia affinis, a critically endangered

    species endemic to Lord Howe and Norfolk Islands. Using two herbicides, Asset (designed to affect only grasses) and

    Glyphosate (a general herbicide), we compared effectiveness in reducing grass cover on a population of Calystegia

    affinis. We protected Calystegia plants from the herbicides by ensuring their leaves were covered by plastic bags

    during herbicide application. Both herbicides were similarly effective in reducing grass cover after four weeks and

    had no noticeable adverse affect on Calystegia (suggesting the plastic bag protection was effective). After 26 weeks,

    Glyphosate was more effective in maintaining a reduced grass cover. Plots treated with either herbicide had a greater

    relative increase in abundance of Calystegia stems compared to untreated controls. The Glyphosate treatment resulted

    in the greatest relative increase in stem abundance, but this was not significantly greater than in the Asset treatment.

    We consider that spraying with Glyphosate treatment, with follow-up monitoring and spot-spraying, will assist the

    recovery of the Calystegia affinis population. Ultimately, the maintenance of a weed-free zone at the forest edge will

    provide suitable habitat for additional recruitment of this and other native species.

UOW Authors


  •   Hutton, Ian (external author)
  •   Coenraads, Robert (external author)
  •   Auld, Tony
  •   Denham, Andrew
  •   Ooi, Mark
  •   Brown, Dianne (external author)

Publication Date


  • 2008

Citation


  • Hutton, I., Coenraads, R., Auld, T. D., Denham, A. J., Ooi, M. K. & Brown, D. (2008). Herbicide impacts on exotic grasses and a population of the critically endangered herb Calystegia affinis (Convolvulaceae) on Lord Howe Island. Cunninghamia, 10 (4), 539-545.

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/4418

Number Of Pages


  • 6

Start Page


  • 539

End Page


  • 545

Volume


  • 10

Issue


  • 4

Place Of Publication


  • Australia

Abstract


  • Introduced perennial grasses are capable of altering the habitat of native species, causing reductions in

    population size and vigour, and potentially affecting life-history processes such as survival, pollination and seedling

    recruitment. We examined the utility of herbicide treatment on two exotic grasses, Pennisetum clandestinum (Kikuyu)

    and Stenotaphrum secundatum (Buffalo grass) to restore the habitat of Calystegia affinis, a critically endangered

    species endemic to Lord Howe and Norfolk Islands. Using two herbicides, Asset (designed to affect only grasses) and

    Glyphosate (a general herbicide), we compared effectiveness in reducing grass cover on a population of Calystegia

    affinis. We protected Calystegia plants from the herbicides by ensuring their leaves were covered by plastic bags

    during herbicide application. Both herbicides were similarly effective in reducing grass cover after four weeks and

    had no noticeable adverse affect on Calystegia (suggesting the plastic bag protection was effective). After 26 weeks,

    Glyphosate was more effective in maintaining a reduced grass cover. Plots treated with either herbicide had a greater

    relative increase in abundance of Calystegia stems compared to untreated controls. The Glyphosate treatment resulted

    in the greatest relative increase in stem abundance, but this was not significantly greater than in the Asset treatment.

    We consider that spraying with Glyphosate treatment, with follow-up monitoring and spot-spraying, will assist the

    recovery of the Calystegia affinis population. Ultimately, the maintenance of a weed-free zone at the forest edge will

    provide suitable habitat for additional recruitment of this and other native species.

UOW Authors


  •   Hutton, Ian (external author)
  •   Coenraads, Robert (external author)
  •   Auld, Tony
  •   Denham, Andrew
  •   Ooi, Mark
  •   Brown, Dianne (external author)

Publication Date


  • 2008

Citation


  • Hutton, I., Coenraads, R., Auld, T. D., Denham, A. J., Ooi, M. K. & Brown, D. (2008). Herbicide impacts on exotic grasses and a population of the critically endangered herb Calystegia affinis (Convolvulaceae) on Lord Howe Island. Cunninghamia, 10 (4), 539-545.

Ro Metadata Url


  • http://ro.uow.edu.au/scipapers/4418

Number Of Pages


  • 6

Start Page


  • 539

End Page


  • 545

Volume


  • 10

Issue


  • 4

Place Of Publication


  • Australia