Australasian Plant Pathology

, Volume 19, Issue 4, pp 124–125

Efficacy of potassium phosphonate in controlling Phytophthora root rot of subterranean clover and ornamental plants in Victoria

  • R. F. de Boer
  • F. C. Greenhalgh

DOI: 10.1071/APP9900124

Cite this article as:
de Boer, R.F. & Greenhalgh, F.C. Australasian Plant Pathology (1990) 19: 124. doi:10.1071/APP9900124


The efficacy of phosphonic acid (phosphorous acid) (Foli-R-Fos 200, 20% wlv potassium phosphonate) to control root rots of subterranean clover and ornamental plant species caused by Phytophthora spp. was evaluated. The fungicide effectively protected subterranean clover plants (cv. Woogenellup) from severe tap-root rot caused by P. clandestina in irrigated pastures and also protected several ornamental species grown in pasteurised potting mixes from severe root rot caused by either P. cinnamomi or P. cryptogea. The fungicide has the potential to restore the productivity of pastures based on the root rot susceptible subterranean clover cultivar Woogenellup in irrigated areas and offers an alternative to currently registered fungicides for the control of Phytophthora root rot of ornamental plant species.

Copyright information

© Australasian Plant Pathology Society 1990

Authors and Affiliations

  • R. F. de Boer
    • 1
  • F. C. Greenhalgh
    • 1
  1. 1.Department of Agriculture and Rural AffairsInstitute of Plant SciencesBurnley

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