The use of potassium phosphonate to control Phytophthora cinnamomi in native vegetation at Anglesea, Victoria
- 119 Downloads
Field and laboratory experiments were used to determine the effectiveness of potassium phosphonate for control of Phytophthora cinnamomi in native plants. Potassium phosphonate (from phosphonic acid neutralised with potassium hydroxide) was hand-sprayed on native vegetation in field sites at Anglesea, Victoria. Potassium phosphonate concentrations of 6 g a.i./L controlled disease progress in plants of Xanthorrhoea australis that exhibited the initial decline stages of infection. Plants that showed severe disease symptoms including brown foliage died irrespective of potassium phosphonate treatment. Phytotoxicity occurred in 9 out of 36 plant species at a concentration of 6 g a.i./L potassium phosphonate. Species most severely affected by potassium phosphonate were Banksia marginata and Eucalyptus willisii. Closed environment experiments on four species showed phytotoxicity to seedlings of E. willisii and Leptospermum myrsinoides. Laboratory analyses of isolates of P cinnamomi from the field sites showed inhibition of hyphal growth at potassium phosphonate concentrations ≥1 g a.i./L. When used at appropriate concentrations, potassium phosphonate has potential to control P cinnamomi in the types of heathland and forest communities studied.
Additional keywordscinnamon fungus Phytophthora control systemic fimgicide
Unable to display preview. Download preview PDF.
- Anon. (1996) — Statistix for Windows, Analytical Software.Google Scholar
- Bennalick, R.A. (1995) — The effect of phosphonate concentration on phytotoxicity symptoms in three understorey species of Eucalyptus marginata Donn ex Sm. forest and their colonisation by Phytophthora cinnamomi Rands. Honours thesis. Murdoch University, Western Australia.Google Scholar
- Cahill, D.M., Grant, B, and Weste, G. (1985) — How does Phytophthora cinnamomi kill a susceptible eucalypt? Australasian Plant Pathology 14: 59–60.Google Scholar
- Coffey, M.D. and Ouimette, D.G. (1989) — Phosphonates: antifungal compounds against Oomycetes. In Nitrogen, Phosphorus and Sulphur Utilisation by Fungi. Symposium of the British Mycological Society (Eds L. Boddy, R. Marchant and D.J. Reed), pp. 107–129. Cambridge University Press, Cambridge, UK.Google Scholar
- Marks, G.C. and Kassaby F.Y. (1974) — Detection of Phytophthora cinnamomi in soils. Australian Forestry 36: 198–203.Google Scholar
- Meredith, C. (1986) — The vegetation of the Anglesea Lease Area. Report prepared for the Land Conservation Council, Government of Victoria.Google Scholar
- Wilson, B.A., Lewis, A. and Aberton, J.G. (1997) — Conservation of national estate communities threatened by Cinnamon fungus at Anglesea, Victoria. A report to the Department of Natural Resources and Environment, Victoria.Google Scholar