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Control of the exotic bulb, Yellow Soldier (Lachenalia reflexa) invading a Banksia woodland, Perth, Western Australia

Authors

  • Kate Brown,

  • Kris Brooks,

  • Sally Madden,

  • Janice Marshall


  • Kate Brown and Kris Brooks are project officers with the Environmental Weeds Action Network (c/- Swan Catchment Centre, P.O Box 1906 Midland, WA 6936. Email: kate.brown@wrc.wa.gov.au). Sally Madden is botanist with the Department for Planning and Infrastructure,(469 Wellington St, Perth, WA 6000) and Janice Marshall is coordinator with the Friends of Shenton Bushland (Inc.) (c/- 2/233 Hensman Road, Shenton Park, WA 6008). This project was undertaken as part of ongoing efforts to improve the effectiveness of bush regeneration projects in southwest Western Australia where a range of exotic bulbs invade native plant communities including Banksia woodland, competing with the herbaceous components of the native understorey.

Abstract

Summary In recent times managers have become increasingly aware of the South African bulbous species Yellow Soldier (Lachenalia reflexa) becoming a serious weed of bushland on the Swan Coastal Plain. In 1998, trials were implemented to investigate control options for Yellow Soldier invading the understorey of a Banksia (Banksia attenuata) Woodland west of Perth. Our trials showed that hand removal over two seasons left all natives intact but was very labour intensive, only reducing cover of Yellow Soldier by 44%. It also triggered germination by ephemeral weeds. Wiping the leaves of individual plants with a 10% glyphosate solution was not effective and was also highly labour intensive. Spot spraying with metsulfuron methyl at 0.2 g/15 L (5 g/ha) reduced the cover of Yellow Soldier by 65%, was easier to implement and appeared to have had insignificant effects on natives. We hope that this trial will encourage other workers in the field to undertake controlled trials to refine treatments at restoration sites.

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