Bondi Junction NSW, Australia
Fact Sheets
Avocado dieback (120)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds


  • Worldwide distribution. On avocado and many other fruit, nut and forest trees, and ornamentals. A water mould, oomycete, not a fungus, kills the fine roots, causing loss of leaves, fruit, dieback and death (3-5 years). An important disease.
  • Spread in ground water, soil on machinery, shoes, horticultural trade.
  • Cultural control: use pasteurised soil in nursery, clean pots, tools and water; choose well-drained sites (dig hole, fill with water, and check water drains away in an hour); avoid spread in soil on plants, tools, footwear and vehicles; add organic matter as mulches, manures or composts, at planting and regularly thereafter; use gypsum; check availability of tolerant varieties.
  • Chemical control: use phosphorous acid as trunk injection or spays. Get advice on methods and timing.

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