Bondi Junction NSW, Australia
Fact Sheets
2021-09-08T03:14:50.7177813Z
   6
Papaya Phytophthora fruit & root rot (152)
Pacific Pests, Pathogens and Weeds
Pacific Pests, Pathogens and Weeds

Summary

  • Worldwide distribution. On coconut, cocoa, avocado, citrus and breadfruit, papaya and more. An important disease, worse in waterlogged soils at high temperatures.
  • Large areas of rot on lower fruit with white fungal growth, progressing upwards. Rots occur on stems via leaf and fruit scars. Roots rots cause wilts.
  • Spread in rain splash, wind, machinery, ground water.
  • Cultural control: improve drainage - plant on ridges or raised beds; mulch to stop rain splash; collect and burn infected fruit and stems; 4-year crop rotation.
  • Chemical control: chlorothalonil, copper, mancozeb (protectants); or alternate with metalaxyl or phosphorous acid (systemics).

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