Australasian Plant Pathology

, Volume 18, Issue 3, pp 57–59

Phytotoxicity in mandarins caused by phosphorous acid

  • G. E. Walker


Growth rates of young mandarin (Citrus reticulata cv. Imperial) trees on C. sinensis rootstocks were reduced by foliar sprays or soil drenches with m-d KP Foli-R-Fos (20% a.i. phosphorous acid) at rates of 2 L/100 L water or higher. Foliar sprays caused leaf burn, particularly to new growth. Growth rates of trees treated with soil drenches of Ridomil 50G (5% a.i. metalaxyl) at 20 g/m2 were not significantly different from those of either check trees or trees sprayed with m-d KP at 2 L/100 L water.


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  1. Chapman, H.D. (1968)—The mineral nutrition of citrus. In The Citrus Industry Vol II. (Eds W. Reuther, L.D. Batchelor and H.J. Webber), pp. 127–289. University of California Press: California.Google Scholar
  2. Cohen, Y. and Coffey, M.D. (1986)—Systemic fungicides and the control of Oomycetes. Annual Review of Phytopathology 24: 311–338.CrossRefGoogle Scholar
  3. Davis, R.M. (1982)—Control of Phytophthora root and foot rot of citrus with systemic fungicides metalaxyl and phosethyl aluminium. Plant Disease 66: 218–220.CrossRefGoogle Scholar
  4. Laville, E.Y. and Chalandon, A.J. (1982)—Control of Phytophthora gummosis in citrus with foliar sprays of fosetyl Al, a new systemic fungicide. In Proceedings of the International Congress of Citriculture, 1981 (Ed K. Matsumoto), pp. 346–349. Japan Chapter, International Society of Citriculture, Okitsu.Google Scholar
  5. Lee, T.C. and Wicks, T.J. (1982)—Evaluation of fungicides for the control of Phytophthora nicotianae var. parasitica in container-grown Rough Lemon rootstock. Australasian Plant Pathology 11: 31–33.CrossRefGoogle Scholar
  6. McMillan, R.T. (1983)—Control of citrus foot rot and root rot. Proceedings of the Florida State Horticultural Society 96: 221–222.Google Scholar
  7. Northcote, K.H. (1952) — A descriptive list of the soil types occurring in the Loxton Irrigation Area, South Australia. CSIRO Division of Soils, Technical Memorandum 8/52.Google Scholar
  8. Walker, G.E. (1988)—Phytophthora root rot of containergrown citrus as affected by foliar sprays and soil drenches of phosphorous and acetyl salicylic acids. Plant and Soil 107: 107–112.CrossRefGoogle Scholar

Copyright information

© Australasian Plant Pathology Society 1989

Authors and Affiliations

  • G. E. Walker
    • 1
  1. 1.South Australian Department of AgricultureLoxton Research CentreLoxton

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