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Evaluation of phosphonic (phosphorous) acid for controlling Phytophthora crown and trunk rot of peach and apricot

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Abstract

Phosphonic acid (PA) showed moderate inhibition of mycelial growth of Phytophthora cactorum, with an ED50 of 11.3 μg/mL. On the trunks of 8-year-old inoculated peach trees, previously injected with 4 g/tree, PA prevented the development of lesions for up to 12 months. Similar results were obtained when 20-year-old apricot trees were injected with 8 or 10 g/tree. When injected after successful inoculation, PA significantly retarded the development of lesions, causing them to dry up and heal. Furthermore, when sprayed on 3-year-old peach trees at 1 g/tree, there were indications that PA prevented lesion formation for up to 6 months.

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Authors and Affiliations

  1. lnstitute for Irrigation and Salinity Research, 3616, Tatura, Victoria

    T. M. Lim & P. H. Jerie

  2. Plant Research Institute, Swan Street, 3121, Burnley, Victoria

    P. R. Merriman

Authors
  1. T. M. Lim
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  2. P. H. Jerie
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  3. P. R. Merriman
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Lim, T.M., Jerie, P.H. & Merriman, P.R. Evaluation of phosphonic (phosphorous) acid for controlling Phytophthora crown and trunk rot of peach and apricot. Australasian Plant Pathology 19, 134–136 (1990). https://doi.org/10.1071/APP9900134

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  • DOI: https://doi.org/10.1071/APP9900134

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